[ { "sku": "61814-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6814LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6814LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "Contact seals add drag and heat: 61814-2RS-NTN runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61814-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61814-2RS-NTN.", "Never mix components between two 61814-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6814LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61814; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814LLU on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "Standard catalogue stock of 61814 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61814 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS-NTN bearing?", "a": "A 61814-2RS-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61814-2RS-NTN need?", "a": "61814-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "Is 6814LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-llu", "6814llu", "61814-2RS", "61814-2rs", "6814LLU", "61814-2RS-NTN" ], "locale_variants": {} }, { "sku": "61814-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6814LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 6900, "max_rpm": 6900, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61814-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6814LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "RSR low-friction seals on 61814-RSR-NTN run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The low-drag lip of 61814-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61814-RSR-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61814-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6814LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6900 r/min the grease limiting speed for 61814 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 6900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814LLB on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61814 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR-NTN bearing?", "a": "A 61814-RSR-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61814-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814-RSR-NTN need?", "a": "61814-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6814LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-llb", "6814llb", "61814-RSR", "61814-rsr", "6814LLB", "61814-RSR-NTN" ], "locale_variants": {} }, { "sku": "61814-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6814ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.4, "static_load_kN": 11.9, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 6900, "max_rpm": 6900, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61814-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6814ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "ZZ shields are non-contact: 61814-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61814-2RS for that.", "Shielded 61814-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6814ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 61814 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6900 r/min the grease limiting speed for 61814 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61814 at 13.4 kN dynamic (C) and 11.9 kN static (C0), 0.8 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 137 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.4/11.9 kN load ratings, 0.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 6900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 137 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6814ZZ on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61814 is listed." ], "faq": [ { "q": "What are the dimensions of a 61814-ZZ-NTN bearing?", "a": "A 61814-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61814-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61814?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6814ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×90×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6814ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61814-zz", "6814zz", "61814-ZZ", "6814ZZ", "61814-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61914-NTN", "brand": "NTN", "manufacturer_designation": "6914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 61914-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61914 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914 on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61914 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61914-NTN bearing?", "a": "A 61914-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61914 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61914 uses the same ISO 15 envelope (70×100×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61914?", "a": "NTN lists the open 61914 under the bare designation 6914; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6914 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6914", "61914", "61914-NTN" ], "locale_variants": {} }, { "sku": "61914-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6914LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61914-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6914LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61914-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61914-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61914-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6914LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 61914; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914LLU on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS-NTN bearing?", "a": "A 61914-2RS-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61914-2RS-NTN need?", "a": "61914-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61914 with a housing grease fitting instead." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 61914 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6914LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-llu", "6914llu", "61914-2RS", "61914-2rs", "6914LLU", "61914-2RS-NTN" ], "locale_variants": {} }, { "sku": "61914-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6914LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6914LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61914-RSR-NTN run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The low-drag lip of 61914-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues this low-friction non-contact seal as 6914LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914LLB on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Standard catalogue stock of 61914 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61914 is listed." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR-NTN bearing?", "a": "A 61914-RSR-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61914-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61914-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "How should 61914-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Is 6914LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-llb", "6914llb", "61914-RSR", "61914-rsr", "6914LLB", "61914-RSR-NTN" ], "locale_variants": {} }, { "sku": "61914-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6914ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 26.3, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.45, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 334, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61914-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6914ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61914-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61914-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61914-ZZ-NTN.", "NTN catalogues the shielded version as 6914ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 61914 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6500 r/min the grease limiting speed for 61914 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 26.3 kN dynamic load rating (C) and 21.2 kN static (C0), 1.45 kN fatigue load limit Cu, 61914 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 334 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 26.3/21.2 kN load ratings, 1.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 6500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 334 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6914ZZ on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive.", "Order the C3 internal-clearance version (61914 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61914-ZZ-NTN bearing?", "a": "A 61914-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61914 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61914 uses the same ISO 15 envelope (70×100×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61914-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61914-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61914?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6914ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×100×16 mm ISO 15 envelope." }, { "q": "Is 6914ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61914-zz", "6914zz", "61914-ZZ", "6914ZZ", "61914-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16014", "brand": "NTN", "manufacturer_designation": "16014", "series": "16000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 441, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 16014 with C3 clearance and re-check the residual value after mounting.", "Because the 160xx narrow section shares the 110 mm OD of the 6014 at 70 mm bore but is only 13 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16014 units.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 16014 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 16014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 16014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 16014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 16014 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 441 g, 16014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×13 mm envelope of 16014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 441 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16014 on the 70×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16014 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (16014 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16014 bearing?", "a": "A 16014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 13 mm width (2.756 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 70 mm bore?", "a": "160 is the narrow extra-light section: 110×13 mm with a 20.0 mm radial section at 70 mm bore. It has the same bore and outside diameter as the 6014 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16014 uses the same ISO 15 envelope (70×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16014?", "a": "NTN lists the open 16014 under the bare designation 16014; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Does NTN offer 16014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16014 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16014" ], "locale_variants": {} }, { "sku": "6014-NTN", "brand": "NTN", "manufacturer_designation": "6014", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6014-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6014-NTN.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014 on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "Order the C3 internal-clearance version (6014 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6014-NTN bearing?", "a": "A 6014-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6014-NTN have?", "a": "Unless a clearance suffix says otherwise, 6014-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "How should 6014-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6014?", "a": "NTN lists the open 6014 under the bare designation 6014; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6014 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014", "6014-NTN" ], "locale_variants": {} }, { "sku": "6014-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6014LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6014LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6014-2RS-NTN runs slower and cooler-limited than the open 6014; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6014-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014-2RS-NTN.", "NTN catalogues the contact-sealed version as 6014LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6014; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014LLU on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS-NTN bearing?", "a": "A 6014-2RS-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6014-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6014-2RS-NTN need?", "a": "6014-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6014 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-llu", "6014llu", "6014-2RS", "6014-2rs", "6014LLU", "6014-2RS-NTN" ], "locale_variants": {} }, { "sku": "6014-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6014LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6014-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6014LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6014-RSR-NTN run faster than contact-seal 6014-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6014-2RS instead.", "The low-drag lip of 6014-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6014-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6014LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014LLB on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6014-RSR-NTN bearing?", "a": "A 6014-RSR-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6014-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-llb", "6014llb", "6014-RSR", "6014-rsr", "6014LLB", "6014-RSR-NTN" ], "locale_variants": {} }, { "sku": "6014-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6014ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42, "static_load_kN": 31, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 604, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6014ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "Do not wash 6014-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6014-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6014-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6014ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6014 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 6014 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6014 at 42 kN dynamic (C) and 31 kN static (C0), 2.3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 604 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 42/31 kN load ratings, 2.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 604 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6014ZZ on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6014 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ-NTN bearing?", "a": "A 6014-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6014-ZZ-NTN need?", "a": "6014-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6014?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6014ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×110×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6014 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6014ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6014-zz", "6014zz", "6014-ZZ", "6014ZZ", "6014-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6214-NTN", "brand": "NTN", "manufacturer_designation": "6214", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6214 with C3 clearance and re-check the residual value after mounting.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6214-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6214 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6214-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6214 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214 on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6214-NTN bearing?", "a": "A 6214-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6214 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6214 uses the same ISO 15 envelope (70×125×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6214-NTN have?", "a": "Unless a clearance suffix says otherwise, 6214-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6214?", "a": "NTN lists the open 6214 under the bare designation 6214; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "What cage does NTN fit in 6214?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214", "6214-NTN" ], "locale_variants": {} }, { "sku": "6214-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6214LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6214LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6214 against the shaft shoulder while it cools so the ring cannot creep back.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6214-2RS-NTN runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6214-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6214LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6214; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214LLU on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS-NTN bearing?", "a": "A 6214-2RS-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6214-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-llu", "6214llu", "6214-2RS", "6214-2rs", "6214LLU", "6214-2RS-NTN" ], "locale_variants": {} }, { "sku": "6214-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6214LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6214LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6214 against the shaft shoulder while it cools so the ring cannot creep back.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6214-RSR-NTN run faster than contact-seal 6214-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6214-2RS instead.", "The low-drag lip of 6214-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6214LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214LLB on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6214-RSR-NTN bearing?", "a": "A 6214-RSR-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6214-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-llb", "6214llb", "6214-RSR", "6214-rsr", "6214LLB", "6214-RSR-NTN" ], "locale_variants": {} }, { "sku": "6214-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6214ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69, "static_load_kN": 44, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 1070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6214-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 125 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6214ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6214-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Do not wash 6214-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6214ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6214 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 6214 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6214 at 69 kN dynamic (C) and 44 kN static (C0), 3.45 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1070 g (1.1 kg), 6214 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 69/44 kN load ratings, 3.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6214ZZ on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6214 is listed." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ-NTN bearing?", "a": "A 6214-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6214-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-ZZ-NTN need?", "a": "6214-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6214?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6214ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×125×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 6214 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6214ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6214-zz", "6214zz", "6214-ZZ", "6214ZZ", "6214-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6314-NTN", "brand": "NTN", "manufacturer_designation": "6314", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6314 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "The open 6314-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6314-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6314 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314 on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6314 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6314-NTN bearing?", "a": "A 6314-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6314 mean?", "a": "A bare 6314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6314?", "a": "NTN lists the open 6314 under the bare designation 6314; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "What cage does NTN fit in 6314?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314", "6314-NTN" ], "locale_variants": {} }, { "sku": "6314-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6314LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6314LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "Contact seals add drag and heat: 6314-2RS-NTN runs slower and cooler-limited than the open 6314; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6314-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6314LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314LLU on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS-NTN bearing?", "a": "A 6314-2RS-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6314-2RS-NTN need?", "a": "6314-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6314 with a housing grease fitting instead." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-llu", "6314llu", "6314-2RS", "6314-2rs", "6314LLU", "6314-2RS-NTN" ], "locale_variants": {} }, { "sku": "6314-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6314LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6314LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "RSR low-friction seals on 6314-RSR-NTN run faster than contact-seal 6314-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6314-2RS instead.", "The non-contact lip of 6314-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6314LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314LLB on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "Order the C3 internal-clearance version (6314 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6314-RSR-NTN bearing?", "a": "A 6314-RSR-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6314-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-llb", "6314llb", "6314-RSR", "6314-rsr", "6314LLB", "6314-RSR-NTN" ], "locale_variants": {} }, { "sku": "6314-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6314ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 115, "static_load_kN": 68, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 2520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6314-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6314ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6314-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6314-2RS for that.", "Shielded 6314-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6314ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 70 mm bore 6314 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 6314; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 115 kN dynamic load rating (C) and 68 kN static (C0), 5.1 kN fatigue load limit Cu, 6314 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2520 g (2.5 kg), 6314 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 115/68 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6314ZZ on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6314 is listed.", "Order the C3 internal-clearance version (6314 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ-NTN bearing?", "a": "A 6314-ZZ-NTN deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6314 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6314 uses the same ISO 15 envelope (70×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6314?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6314ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 70×150×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6314 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6314ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6314-zz", "6314zz", "6314-ZZ", "6314ZZ", "6314-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6414-NTN", "brand": "NTN", "manufacturer_designation": "6414", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 142, "static_load_kN": 89.5, "fatigue_load_limit_kN": 6.25, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 4830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6414 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 70 mm bore exists for high radial load at moderate rpm; its 180 mm OD and 42 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6414-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6414-NTN.", "The open 6414 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 70 mm bore 6414 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 6414; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 142 kN dynamic load rating (C) and 89.5 kN static (C0), 6.25 kN fatigue load limit Cu, 6414 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4830 g (4.8 kg), 6414 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 70×180×42 mm envelope of 6414 gives a D/d ratio of 2.57 and 55.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 142/89.5 kN load ratings, 6.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4830 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6414 on the 70×180×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6414 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6414-NTN bearing?", "a": "A 6414-NTN deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6414-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6414-NTN need?", "a": "The open 6414-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6414?", "a": "NTN lists the open 6414 under the bare designation 6414; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 70 mm bore envelope." }, { "q": "Is 6414 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6414", "6414-NTN" ], "locale_variants": {} }, { "sku": "61815-NTN", "brand": "NTN", "manufacturer_designation": "6815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61815 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "Storage matters for open bearings: 61815-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61815 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61815 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815 on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61815 is listed." ], "faq": [ { "q": "What are the dimensions of a 61815-NTN bearing?", "a": "A 61815-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61815?", "a": "NTN lists the open 61815 under the bare designation 6815; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "What cage does NTN fit in 6815?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6815", "61815", "61815-NTN" ], "locale_variants": {} }, { "sku": "61815-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6815LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6815LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "Heat is the enemy of the sealed 61815-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61815-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-2RS-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61815-2RS-NTN.", "NTN catalogues the contact-sealed version as 6815LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 61815; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815LLU on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61815 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS-NTN bearing?", "a": "A 61815-2RS-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61815-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61815-2RS-NTN need?", "a": "61815-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61815 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6815LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-llu", "6815llu", "61815-2RS", "61815-2rs", "6815LLU", "61815-2RS-NTN" ], "locale_variants": {} }, { "sku": "61815-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6815LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61815-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6815LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The low-drag lip of 61815-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61815-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61815-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6815LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815LLB on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "Order the C3 internal-clearance version (61815 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR-NTN bearing?", "a": "A 61815-RSR-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61815-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "Does NTN offer 61815 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6815LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-llb", "6815llb", "61815-RSR", "61815-rsr", "6815LLB", "61815-RSR-NTN" ], "locale_variants": {} }, { "sku": "61815-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6815ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.9, "static_load_kN": 12.9, "fatigue_load_limit_kN": 0.85, "limiting_speed_rpm": 6400, "max_rpm": 6400, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6815ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "ZZ shields are non-contact: 61815-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61815-2RS for that.", "Shielded 61815-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61815-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6815ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 61815 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6400 r/min the grease limiting speed for 61815 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61815 at 13.9 kN dynamic (C) and 12.9 kN static (C0), 0.85 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 145 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 13.9/12.9 kN load ratings, 0.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 6400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 145 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6815ZZ on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61815-ZZ-NTN bearing?", "a": "A 61815-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61815 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61815 uses the same ISO 15 envelope (75×95×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61815-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61815-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61815?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6815ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×95×10 mm ISO 15 envelope." }, { "q": "Is 6815ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-zz", "6815zz", "61815-ZZ", "6815ZZ", "61815-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61915-NTN", "brand": "NTN", "manufacturer_designation": "6915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61915 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61915-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×105×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61915-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61915-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61915 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915 on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61915 is listed.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61915-NTN bearing?", "a": "A 61915-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61915-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61915?", "a": "NTN lists the open 61915 under the bare designation 6915; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 6915 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6915", "61915", "61915-NTN" ], "locale_variants": {} }, { "sku": "61915-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6915LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6915LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61915-2RS-NTN runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61915-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6915LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 61915; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915LLU on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Order the C3 internal-clearance version (61915 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS-NTN bearing?", "a": "A 61915-2RS-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61915-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61915-2RS-NTN need?", "a": "61915-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61915 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-llu", "6915llu", "61915-2RS", "61915-2rs", "6915LLU", "61915-2RS-NTN" ], "locale_variants": {} }, { "sku": "61915-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6915LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6915LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61915-RSR-NTN run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 105 mm OD should be round within IT7; an oval bore pinches the outer ring of 61915-RSR-NTN and shows up later as two-point loaded raceway wear.", "Never mix components between two 61915-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6915LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915LLB on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR-NTN bearing?", "a": "A 61915-RSR-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61915-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-llb", "6915llb", "61915-RSR", "61915-rsr", "6915LLB", "61915-RSR-NTN" ], "locale_variants": {} }, { "sku": "61915-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6915ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "max_rpm": 6100, "weight_g": 353, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6915ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61915-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61915-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61915-ZZ-NTN.", "NTN catalogues the shielded version as 6915ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 61915 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6100 r/min the grease limiting speed for 61915 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27 kN dynamic load rating (C) and 22.6 kN static (C0), 1.52 kN fatigue load limit Cu, 61915 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 353 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 6100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 353 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6915ZZ on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive.", "Standard catalogue stock of 61915 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61915-ZZ-NTN bearing?", "a": "A 61915-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61915-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61915-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61915 and verify the residual clearance after mounting." }, { "q": "How should 61915-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61915?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6915ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×105×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6915ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61915-zz", "6915zz", "61915-ZZ", "6915ZZ", "61915-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16015", "brand": "NTN", "manufacturer_designation": "16015", "series": "16000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 464, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16015 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16015 with C3 for those conditions.", "The 160xx narrow section at 75 mm bore shares the 115 mm outside diameter of the 6015 but is only 13 mm wide; a 6015 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16015 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 16015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 16015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 16015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.6 kN fatigue load limit Cu, 16015 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 464 g, 16015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×13 mm envelope of 16015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 27.6/24 kN load ratings, 1.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 464 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16015 on the 75×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16015 in a rated drive.", "Standard catalogue stock of 16015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16015 bearing?", "a": "A 16015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 13 mm width (2.953 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 75 mm bore?", "a": "160 is the narrow extra-light section: 115×13 mm with a 20.0 mm radial section at 75 mm bore. It has the same bore and outside diameter as the 6015 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16015 uses the same ISO 15 envelope (75×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16015?", "a": "NTN lists the open 16015 under the bare designation 16015; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 16015 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16015" ], "locale_variants": {} }, { "sku": "6015-NTN", "brand": "NTN", "manufacturer_designation": "6015", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6015-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6015-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015 on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6015 is listed." ], "faq": [ { "q": "What are the dimensions of a 6015-NTN bearing?", "a": "A 6015-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6015 mean?", "a": "A bare 6015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6015?", "a": "NTN lists the open 6015 under the bare designation 6015; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Is 6015 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015", "6015-NTN" ], "locale_variants": {} }, { "sku": "6015-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6015LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6015LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6015 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6015-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6015-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6015LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6015; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015LLU on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6015 is listed.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS-NTN bearing?", "a": "A 6015-2RS-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6015-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6015 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6015LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-llu", "6015llu", "6015-2RS", "6015-2rs", "6015LLU", "6015-2RS-NTN" ], "locale_variants": {} }, { "sku": "6015-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6015LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6015-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6015LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6015-RSR-NTN run faster than contact-seal 6015-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6015-2RS instead.", "The non-contact lip of 6015-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 6015-RSR-NTN and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6015-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6015LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015LLB on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR-NTN bearing?", "a": "A 6015-RSR-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Is 6015LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-llb", "6015llb", "6015-RSR", "6015-rsr", "6015LLB", "6015-RSR-NTN" ], "locale_variants": {} }, { "sku": "6015-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6015ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 649, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6015-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6015ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Do not wash 6015-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6015-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6015ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6015 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 6015 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6015 at 44 kN dynamic (C) and 33.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 44/33.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 649 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6015ZZ on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive.", "Standard catalogue stock of 6015 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ-NTN bearing?", "a": "A 6015-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6015-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6015?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6015ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×115×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 6015 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6015ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6015-zz", "6015zz", "6015-ZZ", "6015ZZ", "6015-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6215-NTN", "brand": "NTN", "manufacturer_designation": "6215", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6215 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "The open 6215-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6215 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215 on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Standard catalogue stock of 6215 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6215 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6215-NTN bearing?", "a": "A 6215-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6215-NTN need?", "a": "The open 6215-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6215?", "a": "NTN lists the open 6215 under the bare designation 6215; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215", "6215-NTN" ], "locale_variants": {} }, { "sku": "6215-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6215LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6215-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6215LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "At 75 mm bore the 62xx light series is the workhorse section; its 130×25 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6215-2RS-NTN runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6215-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215-2RS-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6215LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215LLU on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Standard catalogue stock of 6215 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS-NTN bearing?", "a": "A 6215-2RS-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6215-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6215-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6215 and verify the residual clearance after mounting." }, { "q": "How should 6215-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-llu", "6215llu", "6215-2RS", "6215-2rs", "6215LLU", "6215-2RS-NTN" ], "locale_variants": {} }, { "sku": "6215-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6215LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6215LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6215-RSR-NTN run faster than contact-seal 6215-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6215-2RS instead.", "The low-drag lip of 6215-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6215-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6215LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215LLB on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6215-RSR-NTN bearing?", "a": "A 6215-RSR-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6215-RSR-NTN need?", "a": "6215-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6215 with a housing grease fitting instead." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Is 6215LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-llb", "6215llb", "6215-RSR", "6215-rsr", "6215LLB", "6215-RSR-NTN" ], "locale_variants": {} }, { "sku": "6215-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6215ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 73.5, "static_load_kN": 49.5, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6215ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Do not wash 6215-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6215-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6215ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6215 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 6215; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 73.5 kN dynamic load rating (C) and 49.5 kN static (C0), 3.8 kN fatigue load limit Cu, 6215 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1180 g (1.2 kg), 6215 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 73.5/49.5 kN load ratings, 3.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6215ZZ on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ-NTN bearing?", "a": "A 6215-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6215-ZZ-NTN need?", "a": "6215-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6215?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6215ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×130×25 mm ISO 15 envelope." }, { "q": "Does NTN offer 6215 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6215ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6215-zz", "6215zz", "6215-ZZ", "6215ZZ", "6215-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6315-NTN", "brand": "NTN", "manufacturer_designation": "6315", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "The open 6315-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6315-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315-NTN.", "The open 6315 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315 on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Standard catalogue stock of 6315 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6315-NTN bearing?", "a": "A 6315-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6315-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6315?", "a": "NTN lists the open 6315 under the bare designation 6315; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "Does NTN offer 6315 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6315 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315", "6315-NTN" ], "locale_variants": {} }, { "sku": "6315-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6315LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6315LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6315-2RS-NTN runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6315-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6315-2RS-NTN.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6315LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315LLU on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS-NTN bearing?", "a": "A 6315-2RS-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6315 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6315-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Does NTN offer 6315 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6315LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-llu", "6315llu", "6315-2RS", "6315-2rs", "6315LLU", "6315-2RS-NTN" ], "locale_variants": {} }, { "sku": "6315-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6315LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6315LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6315-RSR-NTN run faster than contact-seal 6315-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6315-2RS instead.", "The low-drag lip of 6315-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 6315-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6315LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315LLB on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-RSR-NTN bearing?", "a": "A 6315-RSR-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6315-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Is 6315LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-llb", "6315llb", "6315-RSR", "6315-rsr", "6315LLB", "6315-RSR-NTN" ], "locale_variants": {} }, { "sku": "6315-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6315ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 126, "static_load_kN": 77, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6315-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6315ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6315-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Do not wash 6315-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6315ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 75 mm bore 6315 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 6315; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 126 kN dynamic load rating (C) and 77 kN static (C0), 5.55 kN fatigue load limit Cu, 6315 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3020 g (3.0 kg), 6315 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 126/77 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3020 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6315ZZ on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6315 is listed." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ-NTN bearing?", "a": "A 6315-ZZ-NTN deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6315-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6315-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6315?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6315ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 75×160×37 mm ISO 15 envelope." }, { "q": "Is 6315ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6315-zz", "6315zz", "6315-ZZ", "6315ZZ", "6315-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6415-NTN", "brand": "NTN", "manufacturer_designation": "6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 152, "static_load_kN": 99, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 5720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6415 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 190 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6415-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6415 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6415-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6415-NTN.", "The open 6415 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 75 mm bore 6415 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6415; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 152 kN dynamic load rating (C) and 99 kN static (C0), 6.7 kN fatigue load limit Cu, 6415 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5720 g (5.7 kg), 6415 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 75×190×45 mm envelope of 6415 gives a D/d ratio of 2.53 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 152/99 kN load ratings, 6.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5720 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6415 on the 75×190×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6415 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6415 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6415-NTN bearing?", "a": "A 6415-NTN deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6415-NTN have?", "a": "Unless a clearance suffix says otherwise, 6415-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6415 and verify the residual clearance after mounting." }, { "q": "How should 6415-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6415?", "a": "NTN lists the open 6415 under the bare designation 6415; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 75 mm bore envelope." }, { "q": "What cage does NTN fit in 6415?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6415", "6415-NTN" ], "locale_variants": {} }, { "sku": "61816-NTN", "brand": "NTN", "manufacturer_designation": "6816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61816 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 61816-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61816-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61816 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816 on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61816-NTN bearing?", "a": "A 61816-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61816 mean?", "a": "A bare 61816 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61816?", "a": "NTN lists the open 61816 under the bare designation 6816; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6816?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6816", "61816", "61816-NTN" ], "locale_variants": {} }, { "sku": "61816-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6816LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6816LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 80 mm of 61816-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "Heat is the enemy of the sealed 61816-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61816-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61816-2RS-NTN.", "NTN catalogues the contact-sealed version as 6816LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 61816; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816LLU on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Standard catalogue stock of 61816 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61816 is listed." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS-NTN bearing?", "a": "A 61816-2RS-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61816-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61816-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61816 and verify the residual clearance after mounting." }, { "q": "How should 61816-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-llu", "6816llu", "61816-2RS", "61816-2rs", "6816LLU", "61816-2RS-NTN" ], "locale_variants": {} }, { "sku": "61816-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6816LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6816LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 61816-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "RSR low-friction seals on 61816-RSR-NTN run faster than contact-seal 61816-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61816-2RS instead.", "The low-drag lip of 61816-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61816-RSR-NTN.", "NTN catalogues this low-friction non-contact seal as 6816LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816LLB on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61816-RSR-NTN bearing?", "a": "A 61816-RSR-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61816 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61816 uses the same ISO 15 envelope (80×100×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-llb", "6816llb", "61816-RSR", "61816-rsr", "6816LLB", "61816-RSR-NTN" ], "locale_variants": {} }, { "sku": "61816-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6816ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 13.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 154, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61816-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6816ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.", "ZZ shields are non-contact: 61816-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61816-2RS for that.", "Shielded 61816-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-ZZ-NTN.", "NTN catalogues the shielded version as 6816ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 61816 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 6000 r/min the grease limiting speed for 61816 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61816 at 14 kN dynamic (C) and 13.3 kN static (C0), 0.89 kN fatigue load limit Cu; this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.", "At 154 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 14/13.3 kN load ratings, 0.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 6000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 154 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6816ZZ on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61816 is listed." ], "faq": [ { "q": "What are the dimensions of a 61816-ZZ-NTN bearing?", "a": "A 61816-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61816-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61816?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6816ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×100×10 mm ISO 15 envelope." }, { "q": "Is 6816ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-zz", "6816zz", "61816-ZZ", "6816ZZ", "61816-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61916-NTN", "brand": "NTN", "manufacturer_designation": "6916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61916-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-NTN.", "The open 61916 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916 on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61916 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61916-NTN bearing?", "a": "A 61916-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61916-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-NTN need?", "a": "The open 61916-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61916?", "a": "NTN lists the open 61916 under the bare designation 6916; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6916?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6916", "61916", "61916-NTN" ], "locale_variants": {} }, { "sku": "61916-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6916LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6916LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS-NTN runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61916-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6916LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 61916; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916LLU on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS-NTN bearing?", "a": "A 61916-2RS-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61916-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-2RS-NTN need?", "a": "61916-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "Is 6916LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-llu", "6916llu", "61916-2RS", "61916-2rs", "6916LLU", "61916-2RS-NTN" ], "locale_variants": {} }, { "sku": "61916-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6916LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61916-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 110 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6916LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 80 mm of 61916-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61916-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61916-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-RSR-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6916LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916LLB on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Order the C3 internal-clearance version (61916 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61916 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR-NTN bearing?", "a": "A 61916-RSR-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61916-RSR-NTN need?", "a": "61916-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6916LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-llb", "6916llb", "61916-RSR", "61916-rsr", "6916LLB", "61916-RSR-NTN" ], "locale_variants": {} }, { "sku": "61916-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6916ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.59, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6916ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61916 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61916-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61916-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6916ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 61916 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61916 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 27.6 kN dynamic load rating (C) and 24 kN static (C0), 1.59 kN fatigue load limit Cu, 61916 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 373 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.6/24 kN load ratings, 1.59 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 373 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6916ZZ on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive.", "Order the C3 internal-clearance version (61916 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61916-ZZ-NTN bearing?", "a": "A 61916-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61916-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-ZZ-NTN need?", "a": "61916-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61916?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6916ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×110×16 mm ISO 15 envelope." }, { "q": "Is 6916ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-zz", "6916zz", "61916-ZZ", "6916ZZ", "61916-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16016", "brand": "NTN", "manufacturer_designation": "16016", "series": "16000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 25.1, "fatigue_load_limit_kN": 1.64, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 597, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 80 mm bore shares the 125 mm outside diameter of the 6016 but is only 14 mm wide; a 6016 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16016 units.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16016-C3. No clearance suffix means normal CN clearance.", "The open 16016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 16016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 16016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 28.1 kN dynamic load rating (C) and 25.1 kN static (C0), 1.64 kN fatigue load limit Cu, 16016 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 597 g, 16016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×14 mm envelope of 16016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 28.1/25.1 kN load ratings, 1.64 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 597 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16016 on the 80×125×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16016 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16016 bearing?", "a": "A 16016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 14 mm width (3.15 × 4.921 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 80 mm bore?", "a": "160 is the narrow extra-light section: 125×14 mm with a 22.5 mm radial section at 80 mm bore. It has the same bore and outside diameter as the 6016 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16016 uses the same ISO 15 envelope (80×125×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16016?", "a": "NTN lists the open 16016 under the bare designation 16016; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Is 16016 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16016" ], "locale_variants": {} }, { "sku": "6016-NTN", "brand": "NTN", "manufacturer_designation": "6016", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 80 mm of 6016-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "The open 6016-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6016-NTN drags the lip and overheats it.", "The open 6016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016 on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Standard catalogue stock of 6016 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6016-NTN bearing?", "a": "A 6016-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6016 mean?", "a": "A bare 6016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6016?", "a": "NTN lists the open 6016 under the bare designation 6016; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6016 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6016 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016", "6016-NTN" ], "locale_variants": {} }, { "sku": "6016-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6016LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6016LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS-NTN runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6016-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6016LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 6016; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016LLU on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Order the C3 internal-clearance version (6016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS-NTN bearing?", "a": "A 6016-2RS-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6016-2RS-NTN need?", "a": "6016-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6016 with a housing grease fitting instead." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6016LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-llu", "6016llu", "6016-2RS", "6016-2rs", "6016LLU", "6016-2RS-NTN" ], "locale_variants": {} }, { "sku": "6016-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6016LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6016LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 80 mm of 6016-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6016-RSR-NTN run faster than contact-seal 6016-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6016-2RS instead.", "The non-contact lip of 6016-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6016LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016LLB on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6016 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6016-RSR-NTN bearing?", "a": "A 6016-RSR-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6016-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "Does NTN offer 6016 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6016LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-llb", "6016llb", "6016-RSR", "6016-rsr", "6016LLB", "6016-RSR-NTN" ], "locale_variants": {} }, { "sku": "6016-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6016ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 40, "fatigue_load_limit_kN": 2.91, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 854, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6016-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6016ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 6016-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "ZZ shields are non-contact: 6016-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Shielded 6016-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6016-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6016ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6016 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5300 r/min the grease limiting speed for 6016 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 6016 at 53 kN dynamic (C) and 40 kN static (C0), 2.91 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 854 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 53/40 kN load ratings, 2.91 kN fatigue load limit Cu NTN lists the grease limiting speed at 5300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 854 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6016ZZ on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ-NTN bearing?", "a": "A 6016-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6016-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6016?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6016ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×125×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6016ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6016-zz", "6016zz", "6016-ZZ", "6016ZZ", "6016-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6216-NTN", "brand": "NTN", "manufacturer_designation": "6216", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6216-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6216-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6216 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216 on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6216-NTN bearing?", "a": "A 6216-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6216?", "a": "NTN lists the open 6216 under the bare designation 6216; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216", "6216-NTN" ], "locale_variants": {} }, { "sku": "6216-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6216LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6216LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 80 mm of 6216-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6216-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6216-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6216-2RS-NTN.", "NTN catalogues the contact-sealed version as 6216LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216LLU on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6216 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS-NTN bearing?", "a": "A 6216-2RS-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6216-2RS-NTN need?", "a": "6216-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6216 with a housing grease fitting instead." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Is 6216LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-llu", "6216llu", "6216-2RS", "6216-2rs", "6216LLU", "6216-2RS-NTN" ], "locale_variants": {} }, { "sku": "6216-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6216LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6216LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6216-RSR-NTN run faster than contact-seal 6216-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6216-2RS instead.", "The low-drag lip of 6216-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6216-RSR-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6216LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216LLB on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6216 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6216-RSR-NTN bearing?", "a": "A 6216-RSR-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6216-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6216-RSR-NTN need?", "a": "6216-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6216 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-llb", "6216llb", "6216-RSR", "6216-rsr", "6216LLB", "6216-RSR-NTN" ], "locale_variants": {} }, { "sku": "6216-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6216ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 80.5, "static_load_kN": 53, "fatigue_load_limit_kN": 3.95, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6216-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6216ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6216-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6216-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6216-ZZ-NTN.", "NTN catalogues the shielded version as 6216ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6216 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 6216; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 80.5 kN dynamic load rating (C) and 53 kN static (C0), 3.95 kN fatigue load limit Cu, 6216 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1400 g (1.4 kg), 6216 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 80.5/53 kN load ratings, 3.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6216ZZ on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6216 is listed.", "Order the C3 internal-clearance version (6216 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ-NTN bearing?", "a": "A 6216-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6216?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6216ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×140×26 mm ISO 15 envelope." }, { "q": "Does NTN offer 6216 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6216ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6216-zz", "6216zz", "6216-ZZ", "6216ZZ", "6216-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6316-NTN", "brand": "NTN", "manufacturer_designation": "6316", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6316 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6316-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6316 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316 on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6316-NTN bearing?", "a": "A 6316-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6316 mean?", "a": "A bare 6316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6316?", "a": "NTN lists the open 6316 under the bare designation 6316; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "What cage does NTN fit in 6316?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316", "6316-NTN" ], "locale_variants": {} }, { "sku": "6316-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6316LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6316-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6316LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Contact seals add drag and heat: 6316-2RS-NTN runs slower and cooler-limited than the open 6316; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6316-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6316LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2700 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316LLU on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS-NTN bearing?", "a": "A 6316-2RS-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6316-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6316LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-llu", "6316llu", "6316-2RS", "6316-2rs", "6316LLU", "6316-2RS-NTN" ], "locale_variants": {} }, { "sku": "6316-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6316LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6316LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 6316-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6316-RSR-NTN run faster than contact-seal 6316-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6316-2RS instead.", "The low-drag lip of 6316-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6316-RSR-NTN.", "Never mix components between two 6316-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6316LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316LLB on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6316 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6316-RSR-NTN bearing?", "a": "A 6316-RSR-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6316-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "Does NTN offer 6316 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6316LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-llb", "6316llb", "6316-RSR", "6316-rsr", "6316LLB", "6316-RSR-NTN" ], "locale_variants": {} }, { "sku": "6316-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6316ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 86.5, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6316ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Do not wash 6316-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6316-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 6316-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6316ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 80 mm bore 6316 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6316; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 136 kN dynamic load rating (C) and 86.5 kN static (C0), 6.05 kN fatigue load limit Cu, 6316 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3590 g (3.6 kg), 6316 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 136/86.5 kN load ratings, 6.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3590 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6316ZZ on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6316 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ-NTN bearing?", "a": "A 6316-ZZ-NTN deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6316 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6316 uses the same ISO 15 envelope (80×170×39 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6316-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6316-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6316 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6316?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6316ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 80×170×39 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6316ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6316-zz", "6316zz", "6316-ZZ", "6316ZZ", "6316-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6416-NTN", "brand": "NTN", "manufacturer_designation": "6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 181, "static_load_kN": 125, "fatigue_load_limit_kN": 8.2, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6416 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 200 mm outside diameter and 48 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore exists for high radial load at moderate rpm; its 200 mm OD and 48 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6416-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6416-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6416 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 80 mm bore 6416 is in NTN's upper general-purpose range; the pressed-steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6416; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 181 kN dynamic load rating (C) and 125 kN static (C0), 8.2 kN fatigue load limit Cu, 6416 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6416 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 80×200×48 mm envelope of 6416 gives a D/d ratio of 2.50 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 181/125 kN load ratings, 8.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6416 on the 80×200×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6416 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6416 is listed." ], "faq": [ { "q": "What are the dimensions of a 6416-NTN bearing?", "a": "A 6416-NTN deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6416-NTN need?", "a": "The open 6416-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6416?", "a": "NTN lists the open 6416 under the bare designation 6416; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 80 mm bore envelope." }, { "q": "Does NTN offer 6416 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6416 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "full", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6416", "6416-NTN" ], "locale_variants": {} }, { "sku": "61817-NTN", "brand": "NTN", "manufacturer_designation": "6817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 61817-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The open 61817-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61817-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61817-NTN-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-NTN and shows up later as two-point loaded raceway wear.", "The open 61817 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817 on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61817 is listed." ], "faq": [ { "q": "What are the dimensions of a 61817-NTN bearing?", "a": "A 61817-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61817-NTN need?", "a": "The open 61817-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61817?", "a": "NTN lists the open 61817 under the bare designation 6817; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Is 6817 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6817", "61817", "61817-NTN" ], "locale_variants": {} }, { "sku": "61817-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6817LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6817LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 61817-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS-NTN runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61817-2RS-NTN.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6817LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3100 r/min for 61817; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817LLU on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61817 is listed." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS-NTN bearing?", "a": "A 61817-2RS-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61817-2RS-NTN need?", "a": "61817-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61817 with a housing grease fitting instead." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6817LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-llu", "6817llu", "61817-2RS", "61817-2rs", "6817LLU", "61817-2RS-NTN" ], "locale_variants": {} }, { "sku": "61817-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6817LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61817-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6817LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "RSR low-friction seals on 61817-RSR-NTN run faster than contact-seal 61817-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61817-2RS instead.", "The low-drag lip of 61817-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61817-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6817LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817LLB on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR-NTN bearing?", "a": "A 61817-RSR-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "Is 6817LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-llb", "6817llb", "61817-RSR", "61817-rsr", "6817LLB", "61817-RSR-NTN" ], "locale_variants": {} }, { "sku": "61817-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6817ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.7, "static_load_kN": 19, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 5700, "max_rpm": 5700, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6817ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "ZZ shields are non-contact: 61817-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61817-2RS for that.", "Do not wash 61817-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 61817-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6817ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 61817 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5700 r/min the grease limiting speed for 61817 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 20.7 kN dynamic load rating (C) and 19 kN static (C0), 1.26 kN fatigue load limit Cu, 61817 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 270 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 20.7/19 kN load ratings, 1.26 kN fatigue load limit Cu NTN lists the grease limiting speed at 5700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6817ZZ on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61817 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61817-ZZ-NTN bearing?", "a": "A 61817-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61817-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61817-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61817 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61817?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6817ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×110×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61817 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6817ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-zz", "6817zz", "61817-ZZ", "6817ZZ", "61817-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61917-NTN", "brand": "NTN", "manufacturer_designation": "6917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 85 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61917-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61917-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61917 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917 on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Standard catalogue stock of 61917 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61917 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61917-NTN bearing?", "a": "A 61917-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61917-NTN have?", "a": "Unless a clearance suffix says otherwise, 61917-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61917 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61917?", "a": "NTN lists the open 61917 under the bare designation 6917; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "What cage does NTN fit in 6917?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6917", "61917", "61917-NTN" ], "locale_variants": {} }, { "sku": "61917-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6917LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6917LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 61917 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61917-2RS-NTN runs slower and cooler-limited than the open 61917; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61917-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 61917-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the contact-sealed version as 6917LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 61917; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917LLU on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Standard catalogue stock of 61917 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61917-2RS-NTN bearing?", "a": "A 61917-2RS-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "Is 6917LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-llu", "6917llu", "61917-2RS", "61917-2rs", "6917LLU", "61917-2RS-NTN" ], "locale_variants": {} }, { "sku": "61917-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6917LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6917LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 85 mm of 61917-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61917-RSR-NTN run faster than contact-seal 61917-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61917-2RS instead.", "The non-contact lip of 61917-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 61917-RSR-NTN and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61917-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6917LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917LLB on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61917 is listed." ], "faq": [ { "q": "What are the dimensions of a 61917-RSR-NTN bearing?", "a": "A 61917-RSR-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61917 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6917LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-llb", "6917llb", "61917-RSR", "61917-rsr", "6917LLB", "61917-RSR-NTN" ], "locale_variants": {} }, { "sku": "61917-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6917ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 35.5, "static_load_kN": 29.6, "fatigue_load_limit_kN": 1.99, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 536, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6917ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61917-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61917-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6917ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 61917 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61917 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61917 at 35.5 kN dynamic (C) and 29.6 kN static (C0), 1.99 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 536 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 35.5/29.6 kN load ratings, 1.99 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 536 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6917ZZ on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive.", "Order the C3 internal-clearance version (61917 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61917 is listed." ], "faq": [ { "q": "What are the dimensions of a 61917-ZZ-NTN bearing?", "a": "A 61917-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61917-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61917?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6917ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×120×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6917ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61917-zz", "6917zz", "61917-ZZ", "6917ZZ", "61917-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16017", "brand": "NTN", "manufacturer_designation": "16017", "series": "16000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.7, "static_load_kN": 26.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 626, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16017 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 85 mm bore shares the 130 mm outside diameter of the 6017 but is only 14 mm wide; a 6017 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16017 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16017.", "The open 16017 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 16017 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 16017 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 28.7 kN dynamic load rating (C) and 26.2 kN static (C0), 1.68 kN fatigue load limit Cu, 16017 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 626 g, 16017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 85×130×14 mm envelope of 16017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 28.7/26.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 626 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16017 on the 85×130×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16017 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16017 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16017 bearing?", "a": "A 16017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 14 mm width (3.346 × 5.118 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 16017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16017 uses the same ISO 15 envelope (85×130×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 16017 have?", "a": "Unless a clearance suffix says otherwise, 16017 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16017 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 16017?", "a": "NTN lists the open 16017 under the bare designation 16017; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "What cage does NTN fit in 16017?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16017" ], "locale_variants": {} }, { "sku": "6217-NTN", "brand": "NTN", "manufacturer_designation": "6217", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6217-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6217-NTN.", "The open 6217 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217 on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6217-NTN bearing?", "a": "A 6217-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6217?", "a": "NTN lists the open 6217 under the bare designation 6217; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Is 6217 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217", "6217-NTN" ], "locale_variants": {} }, { "sku": "6217-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6217LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6217LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6217 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6217-2RS-NTN runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6217-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6217LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217LLU on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6217 is listed." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS-NTN bearing?", "a": "A 6217-2RS-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6217LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-llu", "6217llu", "6217-2RS", "6217-2rs", "6217LLU", "6217-2RS-NTN" ], "locale_variants": {} }, { "sku": "6217-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6217LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6217LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 85 mm of 6217-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6217-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6217-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6217-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6217LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217LLB on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Order the C3 internal-clearance version (6217 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6217 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6217-RSR-NTN bearing?", "a": "A 6217-RSR-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6217-RSR-NTN need?", "a": "6217-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6217 with a housing grease fitting instead." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6217LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-llb", "6217llb", "6217-RSR", "6217-rsr", "6217LLB", "6217-RSR-NTN" ], "locale_variants": {} }, { "sku": "6217-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6217ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92, "static_load_kN": 64, "fatigue_load_limit_kN": 4.6, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 1790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6217-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6217ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 6217-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6217-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6217-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6217ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 6217 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 6217; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 92 kN dynamic load rating (C) and 64 kN static (C0), 4.6 kN fatigue load limit Cu, 6217 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1790 g (1.8 kg), 6217 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 92/64 kN load ratings, 4.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1790 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6217ZZ on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6217 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ-NTN bearing?", "a": "A 6217-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6217-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6217?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6217ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×150×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6217 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6217ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6217-zz", "6217zz", "6217-ZZ", "6217ZZ", "6217-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6317-NTN", "brand": "NTN", "manufacturer_designation": "6317", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6317 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 85 mm of 6317-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 85 mm bore gains dynamic rating through larger rolling elements on a 180 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6317-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6317 units.", "Never mix components between two 6317-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-NTN.", "The open 6317 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317 on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6317-NTN bearing?", "a": "A 6317-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6317?", "a": "NTN lists the open 6317 under the bare designation 6317; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 85 mm bore envelope." }, { "q": "Does NTN offer 6317 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6317 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317", "6317-NTN" ], "locale_variants": {} }, { "sku": "6317-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6317LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6317LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6317 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Contact seals add drag and heat: 6317-2RS-NTN runs slower and cooler-limited than the open 6317; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6317-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6317LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317LLU on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS-NTN bearing?", "a": "A 6317-2RS-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6317LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-llu", "6317llu", "6317-2RS", "6317-2rs", "6317LLU", "6317-2RS-NTN" ], "locale_variants": {} }, { "sku": "6317-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6317LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6317-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6317LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 85 mm bore the ring mass is significant: heat 6317 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The low-drag lip of 6317-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6317-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6317-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6317LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317LLB on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6317 is listed." ], "faq": [ { "q": "What are the dimensions of a 6317-RSR-NTN bearing?", "a": "A 6317-RSR-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6317-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6317-RSR-NTN need?", "a": "6317-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6317 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "Is 6317LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-llb", "6317llb", "6317-RSR", "6317-rsr", "6317LLB", "6317-RSR-NTN" ], "locale_variants": {} }, { "sku": "6317-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6317ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 97, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6317ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "ZZ shields are non-contact: 6317-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6317-2RS for that.", "Do not wash 6317-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 41 mm-wide ring of 6317-ZZ-NTN drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-ZZ-NTN.", "NTN catalogues the shielded version as 6317ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 85 mm bore 6317 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 6317; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 97 kN static (C0), 6.55 kN fatigue load limit Cu, 6317 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4230 g (4.2 kg), 6317 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 147/97 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6317ZZ on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6317 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ-NTN bearing?", "a": "A 6317-ZZ-NTN deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6317-ZZ-NTN need?", "a": "6317-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6317?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6317ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 85×180×41 mm ISO 15 envelope." }, { "q": "Does NTN offer 6317 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6317ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6317-zz", "6317zz", "6317-ZZ", "6317ZZ", "6317-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61818-NTN", "brand": "NTN", "manufacturer_designation": "6818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 90 mm of 61818-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "The open 61818-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61818 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-NTN.", "The open 61818 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818 on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61818-NTN bearing?", "a": "A 61818-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61818?", "a": "NTN lists the open 61818 under the bare designation 6818; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "What cage does NTN fit in 6818?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6818", "61818", "61818-NTN" ], "locale_variants": {} }, { "sku": "61818-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6818LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6818LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 90 mm of 61818-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "Contact seals add drag and heat: 61818-2RS-NTN runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61818-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6818LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 61818; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818LLU on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Order the C3 internal-clearance version (61818 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS-NTN bearing?", "a": "A 61818-2RS-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61818-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61818-2RS-NTN need?", "a": "61818-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6818LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-llu", "6818llu", "61818-2RS", "61818-2rs", "6818LLU", "61818-2RS-NTN" ], "locale_variants": {} }, { "sku": "61818-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6818LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6818LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 90 mm of 61818-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "RSR low-friction seals on 61818-RSR-NTN run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61818-RSR-NTN drags the lip and overheats it.", "NTN catalogues this low-friction non-contact seal as 6818LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818LLB on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Order the C3 internal-clearance version (61818 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61818 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR-NTN bearing?", "a": "A 61818-RSR-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61818-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61818-RSR-NTN need?", "a": "61818-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61818 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6818LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-llb", "6818llb", "61818-RSR", "61818-rsr", "6818LLB", "61818-RSR-NTN" ], "locale_variants": {} }, { "sku": "61818-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6818ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.1, "static_load_kN": 19.7, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 5400, "max_rpm": 5400, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61818-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6818ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 90 mm of 61818-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "ZZ shields are non-contact: 61818-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61818-2RS for that.", "Do not wash 61818-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 61818-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 61818-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6818ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 61818 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5400 r/min the grease limiting speed for 61818 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.1 kN dynamic load rating (C) and 19.7 kN static (C0), 1.3 kN fatigue load limit Cu, 61818 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 285 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.1/19.7 kN load ratings, 1.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 5400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 285 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6818ZZ on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive.", "Standard catalogue stock of 61818 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61818-ZZ-NTN bearing?", "a": "A 61818-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61818-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61818-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "How should 61818-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61818?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6818ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×115×13 mm ISO 15 envelope." }, { "q": "Is 6818ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-zz", "6818zz", "61818-ZZ", "6818ZZ", "61818-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61918-NTN", "brand": "NTN", "manufacturer_designation": "6918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61918-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61918-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61918 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918 on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "Standard catalogue stock of 61918 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61918-NTN bearing?", "a": "A 61918-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61918 mean?", "a": "A bare 61918 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61918?", "a": "NTN lists the open 61918 under the bare designation 6918; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Is 6918 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6918", "61918", "61918-NTN" ], "locale_variants": {} }, { "sku": "61918-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6918LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6918LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61918-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 90 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61918-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61918-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6918LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 61918; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918LLU on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61918 is listed.", "Order the C3 internal-clearance version (61918 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61918-2RS-NTN bearing?", "a": "A 61918-2RS-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61918-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61918-2RS-NTN need?", "a": "61918-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61918 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-llu", "6918llu", "61918-2RS", "61918-2rs", "6918LLU", "61918-2RS-NTN" ], "locale_variants": {} }, { "sku": "61918-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6918LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6918LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The low-drag lip of 61918-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61918-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6918LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918LLB on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61918 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61918-RSR-NTN bearing?", "a": "A 61918-RSR-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61918-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-llb", "6918llb", "61918-RSR", "61918-rsr", "6918LLB", "61918-RSR-NTN" ], "locale_variants": {} }, { "sku": "61918-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6918ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 36.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 2.05, "limiting_speed_rpm": 5100, "max_rpm": 5100, "weight_g": 554, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61918-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 125 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6918ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61918-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61918-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918-ZZ-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61918-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6918ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 61918 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5100 r/min the grease limiting speed for 61918 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "NTN rates 61918 at 36.5 kN dynamic (C) and 31.5 kN static (C0), 2.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 554 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 36.5/31.5 kN load ratings, 2.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 5100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 554 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6918ZZ on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61918-ZZ-NTN bearing?", "a": "A 61918-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61918-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61918?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6918ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×125×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61918 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6918ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61918-zz", "6918zz", "61918-ZZ", "6918ZZ", "61918-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16018", "brand": "NTN", "manufacturer_designation": "16018", "series": "16000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.07, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 848, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16018 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 90 mm of 16018 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 90 mm bore shares the 140 mm outside diameter of the 6018 but is only 16 mm wide; a 6018 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16018 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 16018 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 16018 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 16018 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4700 r/min for 16018; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16018 at 37 kN dynamic (C) and 33.5 kN static (C0), 2.07 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 848 g, 16018 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 90×140×16 mm envelope of 16018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 37/33.5 kN load ratings, 2.07 kN fatigue load limit Cu NTN lists the grease limiting speed at 4700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 848 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16018 on the 90×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16018 in a rated drive.", "Order the C3 internal-clearance version (16018 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16018 is listed." ], "faq": [ { "q": "What are the dimensions of a 16018 bearing?", "a": "A 16018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 16 mm width (3.543 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16018 bore code work?", "a": "The last two digits of 16018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16018 mean?", "a": "A bare 16018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16018?", "a": "NTN lists the open 16018 under the bare designation 16018; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "What cage does NTN fit in 16018?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16018" ], "locale_variants": {} }, { "sku": "6218-NTN", "brand": "NTN", "manufacturer_designation": "6218", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6218 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "The open 6218-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6218 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218 on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-NTN bearing?", "a": "A 6218-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6218-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6218?", "a": "NTN lists the open 6218 under the bare designation 6218; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Does NTN offer 6218 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6218 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218", "6218-NTN" ], "locale_variants": {} }, { "sku": "6218-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6218LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6218LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6218-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6218-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6218-2RS-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6218LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218LLU on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6218 is listed.", "Order the C3 internal-clearance version (6218 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS-NTN bearing?", "a": "A 6218-2RS-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6218-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "Is 6218LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-llu", "6218llu", "6218-2RS", "6218-2rs", "6218LLU", "6218-2RS-NTN" ], "locale_variants": {} }, { "sku": "6218-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6218LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6218-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6218LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 90 mm of 6218-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6218-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6218-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6218-RSR-NTN.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues this low-friction non-contact seal as 6218LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218LLB on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6218 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-RSR-NTN bearing?", "a": "A 6218-RSR-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6218-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "Does NTN offer 6218 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6218LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-llb", "6218llb", "6218-RSR", "6218-rsr", "6218LLB", "6218-RSR-NTN" ], "locale_variants": {} }, { "sku": "6218-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6218ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 71.5, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6218ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 90 mm of 6218-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "Do not wash 6218-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6218-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6218-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6218-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6218ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 6218 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 6218; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 5 kN fatigue load limit Cu, 6218 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2150 g (2.1 kg), 6218 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 106/71.5 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6218ZZ on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive.", "Order the C3 internal-clearance version (6218 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ-NTN bearing?", "a": "A 6218-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6218-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6218-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6218?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6218ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×160×30 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6218ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6218-zz", "6218zz", "6218-ZZ", "6218ZZ", "6218-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6318-NTN", "brand": "NTN", "manufacturer_designation": "6318", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6318-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-NTN.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6318 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318 on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6318-NTN bearing?", "a": "A 6318-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6318-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6318?", "a": "NTN lists the open 6318 under the bare designation 6318; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 90 mm bore envelope." }, { "q": "Is 6318 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318", "6318-NTN" ], "locale_variants": {} }, { "sku": "6318-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6318LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6318LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "Contact seals add drag and heat: 6318-2RS-NTN runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6318-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6318LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318LLU on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS-NTN bearing?", "a": "A 6318-2RS-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6318-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Does NTN offer 6318 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6318LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-llu", "6318llu", "6318-2RS", "6318-2rs", "6318LLU", "6318-2RS-NTN" ], "locale_variants": {} }, { "sku": "6318-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6318LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6318LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "RSR low-friction seals on 6318-RSR-NTN run faster than contact-seal 6318-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6318-2RS instead.", "The low-drag lip of 6318-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6318-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6318LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318LLB on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6318-RSR-NTN bearing?", "a": "A 6318-RSR-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6318-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6318-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Does NTN offer 6318 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6318LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-llb", "6318llb", "6318-RSR", "6318-rsr", "6318LLB", "6318-RSR-NTN" ], "locale_variants": {} }, { "sku": "6318-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6318ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 107, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 4910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6318-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6318ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 6318-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6318-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Do not wash 6318-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6318ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 90 mm bore 6318 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3600 r/min for 6318; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 107 kN static (C0), 7.1 kN fatigue load limit Cu, 6318 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4910 g (4.9 kg), 6318 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 158/107 kN load ratings, 7.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 3600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6318ZZ on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6318 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ-NTN bearing?", "a": "A 6318-ZZ-NTN deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6318?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6318ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 90×190×43 mm ISO 15 envelope." }, { "q": "Is 6318ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6318-zz", "6318zz", "6318-ZZ", "6318ZZ", "6318-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61819-NTN", "brand": "NTN", "manufacturer_designation": "6819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 61819-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "The open 61819-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×120×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61819 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819 on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61819 is listed." ], "faq": [ { "q": "What are the dimensions of a 61819-NTN bearing?", "a": "A 61819-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61819 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61819-NTN have?", "a": "Unless a clearance suffix says otherwise, 61819-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61819?", "a": "NTN lists the open 61819 under the bare designation 6819; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "What cage does NTN fit in 6819?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6819", "61819", "61819-NTN" ], "locale_variants": {} }, { "sku": "61819-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6819LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6819LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 95 mm of 61819-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Contact seals add drag and heat: 61819-2RS-NTN runs slower and cooler-limited than the open 61819; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61819-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61819-2RS-NTN.", "NTN catalogues the contact-sealed version as 6819LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 61819; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819LLU on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61819 is listed.", "Standard catalogue stock of 61819 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS-NTN bearing?", "a": "A 61819-2RS-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61819-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61819-2RS-NTN need?", "a": "61819-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61819 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "Is 6819LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-llu", "6819llu", "61819-2RS", "61819-2rs", "6819LLU", "61819-2RS-NTN" ], "locale_variants": {} }, { "sku": "61819-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6819LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6819LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "The low-drag lip of 61819-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61819-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 61819-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues this low-friction non-contact seal as 6819LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819LLB on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61819-RSR-NTN bearing?", "a": "A 61819-RSR-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61819-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61819-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "How should 61819-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "Is 6819LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-llb", "6819llb", "61819-RSR", "61819-rsr", "6819LLB", "61819-RSR-NTN" ], "locale_variants": {} }, { "sku": "61819-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6819ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.4, "static_load_kN": 20.5, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61819-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6819ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 95 mm of 61819-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Do not wash 61819-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61819-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61819-ZZ-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6819ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 61819 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "At 5000 r/min the grease limiting speed for 61819 covers medium-duty industrial drives; the open or shielded execution can run continuously at this speed with standard lithium-soap grease.", "At 21.4 kN dynamic load rating (C) and 20.5 kN static (C0), 1.31 kN fatigue load limit Cu, 61819 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 300 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.4/20.5 kN load ratings, 1.31 kN fatigue load limit Cu NTN lists the grease limiting speed at 5000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6819ZZ on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61819-ZZ-NTN bearing?", "a": "A 61819-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61819-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61819?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6819ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×120×13 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6819ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-zz", "6819zz", "61819-ZZ", "6819ZZ", "61819-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61919-NTN", "brand": "NTN", "manufacturer_designation": "6919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61919 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 61919-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61919-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61919-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61919 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919 on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61919-NTN bearing?", "a": "A 61919-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61919-NTN have?", "a": "Unless a clearance suffix says otherwise, 61919-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61919 and verify the residual clearance after mounting." }, { "q": "How should 61919-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61919?", "a": "NTN lists the open 61919 under the bare designation 6919; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Does NTN offer 61919 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6919 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6919", "61919", "61919-NTN" ], "locale_variants": {} }, { "sku": "61919-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6919LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61919-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6919LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61919-2RS-NTN runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61919-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6919LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919LLU on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61919 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS-NTN bearing?", "a": "A 61919-2RS-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61919-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6919LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-llu", "6919llu", "61919-2RS", "61919-2rs", "6919LLU", "61919-2RS-NTN" ], "locale_variants": {} }, { "sku": "61919-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6919LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6919LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61919-RSR-NTN run faster than contact-seal 61919-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61919-2RS instead.", "The non-contact lip of 61919-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6919LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919LLB on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61919 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61919-RSR-NTN bearing?", "a": "A 61919-RSR-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61919-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61919 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6919LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-llb", "6919llb", "61919-RSR", "61919-rsr", "6919LLB", "61919-RSR-NTN" ], "locale_variants": {} }, { "sku": "61919-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6919ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 579, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6919ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61919-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61919-2RS for that.", "Do not wash 61919-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 61919-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6919ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 61919 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61919; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61919 at 37.5 kN dynamic (C) and 33.5 kN static (C0), 2.1 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 579 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 37.5/33.5 kN load ratings, 2.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 579 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6919ZZ on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive.", "Order the C3 internal-clearance version (61919 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 61919 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61919-ZZ-NTN bearing?", "a": "A 61919-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61919-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61919?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6919ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×130×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6919ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61919-zz", "6919zz", "61919-ZZ", "6919ZZ", "61919-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16019", "brand": "NTN", "manufacturer_designation": "16019", "series": "16000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 38, "static_load_kN": 35, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 885, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16019 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 95 mm bore shares the 145 mm outside diameter of the 6019 but is only 16 mm wide; a 6019 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16019 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16019 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16019-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 16019 drags the lip and overheats it.", "The open 16019 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 16019 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 16019; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16019 at 38 kN dynamic (C) and 35 kN static (C0), 2.13 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 885 g, 16019 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 95×145×16 mm envelope of 16019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 38/35 kN load ratings, 2.13 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 885 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16019 on the 95×145×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16019 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 16019 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16019 bearing?", "a": "A 16019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 16 mm width (3.74 × 5.709 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16019 need?", "a": "The open 16019 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16019 bore code work?", "a": "The last two digits of 16019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16019?", "a": "NTN lists the open 16019 under the bare designation 16019; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Does NTN offer 16019 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16019 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16019" ], "locale_variants": {} }, { "sku": "6219-NTN", "brand": "NTN", "manufacturer_designation": "6219", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 95 mm of 6219-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6219-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6219-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6219-NTN.", "The open 6219 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219 on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6219 is listed." ], "faq": [ { "q": "What are the dimensions of a 6219-NTN bearing?", "a": "A 6219-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6219-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6219?", "a": "NTN lists the open 6219 under the bare designation 6219; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "What cage does NTN fit in 6219?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219", "6219-NTN" ], "locale_variants": {} }, { "sku": "6219-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6219LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6219-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6219LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 95 mm of 6219-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6219-2RS-NTN runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6219-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 32 mm-wide ring of 6219-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6219LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219LLU on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS-NTN bearing?", "a": "A 6219-2RS-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "Is 6219LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-llu", "6219llu", "6219-2RS", "6219-2rs", "6219LLU", "6219-2RS-NTN" ], "locale_variants": {} }, { "sku": "6219-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6219LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6219LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6219-RSR-NTN run faster than contact-seal 6219-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6219-2RS instead.", "The low-drag lip of 6219-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6219-RSR-NTN.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6219LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219LLB on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Standard catalogue stock of 6219 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6219-RSR-NTN bearing?", "a": "A 6219-RSR-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6219LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-llb", "6219llb", "6219-RSR", "6219-rsr", "6219LLB", "6219-RSR-NTN" ], "locale_variants": {} }, { "sku": "6219-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6219ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 121, "static_load_kN": 82, "fatigue_load_limit_kN": 5.55, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6219-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6219ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6219-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6219-2RS for that.", "Shielded 6219-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 170 mm OD should be round within IT7; an oval bore pinches the outer ring of 6219-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6219ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 6219 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3700 r/min for 6219; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 121 kN dynamic load rating (C) and 82 kN static (C0), 5.55 kN fatigue load limit Cu, 6219 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 6219 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 121/82 kN load ratings, 5.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6219ZZ on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive.", "Order the C3 internal-clearance version (6219 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6219 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ-NTN bearing?", "a": "A 6219-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6219-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6219?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6219ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×170×32 mm ISO 15 envelope." }, { "q": "Does NTN offer 6219 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6219ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6219-zz", "6219zz", "6219-ZZ", "6219ZZ", "6219-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6319-NTN", "brand": "NTN", "manufacturer_designation": "6319", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6319 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6319 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "The open 6319-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6319-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-NTN drags the lip and overheats it.", "The open 6319 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319 on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6319 is listed." ], "faq": [ { "q": "What are the dimensions of a 6319-NTN bearing?", "a": "A 6319-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6319-NTN need?", "a": "The open 6319-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6319?", "a": "NTN lists the open 6319 under the bare designation 6319; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 95 mm bore envelope." }, { "q": "Is 6319 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319", "6319-NTN" ], "locale_variants": {} }, { "sku": "6319-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6319LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6319LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 95 mm of 6319-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6319-2RS-NTN runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6319-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6319LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319LLU on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS-NTN bearing?", "a": "A 6319-2RS-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6319-2RS-NTN need?", "a": "6319-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6319 with a housing grease fitting instead." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-llu", "6319llu", "6319-2RS", "6319-2rs", "6319LLU", "6319-2RS-NTN" ], "locale_variants": {} }, { "sku": "6319-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6319LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6319LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 95 mm of 6319-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "RSR low-friction seals on 6319-RSR-NTN run faster than contact-seal 6319-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6319-2RS instead.", "The low-drag lip of 6319-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-RSR-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6319LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319LLB on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6319 is listed." ], "faq": [ { "q": "What are the dimensions of a 6319-RSR-NTN bearing?", "a": "A 6319-RSR-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6319-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-llb", "6319llb", "6319-RSR", "6319-rsr", "6319LLB", "6319-RSR-NTN" ], "locale_variants": {} }, { "sku": "6319-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6319ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 169, "static_load_kN": 119, "fatigue_load_limit_kN": 7.65, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 5670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6319-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6319ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Do not wash 6319-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6319-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6319-ZZ-NTN drags the lip and overheats it.", "Never mix components between two 6319-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6319ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 95 mm bore 6319 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3300 r/min for 6319; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 169 kN dynamic load rating (C) and 119 kN static (C0), 7.65 kN fatigue load limit Cu, 6319 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5670 g (5.7 kg), 6319 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 169/119 kN load ratings, 7.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5670 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6319ZZ on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ-NTN bearing?", "a": "A 6319-ZZ-NTN deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6319-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6319-ZZ-NTN need?", "a": "6319-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6319?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6319ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 95×200×45 mm ISO 15 envelope." }, { "q": "Is 6319ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6319-zz", "6319zz", "6319-ZZ", "6319ZZ", "6319-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61820-NTN", "brand": "NTN", "manufacturer_designation": "6820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "The open 61820-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×125×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Never mix components between two 61820-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61820 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820 on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61820 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61820-NTN bearing?", "a": "A 61820-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61820?", "a": "NTN lists the open 61820 under the bare designation 6820; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6820", "61820", "61820-NTN" ], "locale_variants": {} }, { "sku": "61820-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6820LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6820LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Contact seals add drag and heat: 61820-2RS-NTN runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61820-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-2RS-NTN drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820-2RS-NTN.", "NTN catalogues the contact-sealed version as 6820LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2700 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820LLU on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Order the C3 internal-clearance version (61820 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS-NTN bearing?", "a": "A 61820-2RS-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61820-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61820-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61820 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Is 6820LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-llu", "6820llu", "61820-2RS", "61820-2rs", "6820LLU", "61820-2RS-NTN" ], "locale_variants": {} }, { "sku": "61820-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6820LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61820-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6820LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 61820-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The low-drag lip of 61820-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61820-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-RSR-NTN drags the lip and overheats it.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues this low-friction non-contact seal as 6820LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820LLB on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR-NTN bearing?", "a": "A 61820-RSR-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-llb", "6820llb", "61820-RSR", "61820-rsr", "6820LLB", "61820-RSR-NTN" ], "locale_variants": {} }, { "sku": "61820-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6820ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 21.7, "static_load_kN": 21.2, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 313, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61820-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6820ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Do not wash 61820-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61820-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6820ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 61820 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4800 r/min for 61820; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 21.7 kN dynamic load rating (C) and 21.2 kN static (C0), 1.33 kN fatigue load limit Cu, 61820 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 313 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 21.7/21.2 kN load ratings, 1.33 kN fatigue load limit Cu NTN lists the grease limiting speed at 4800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 313 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6820ZZ on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61820 is listed." ], "faq": [ { "q": "What are the dimensions of a 61820-ZZ-NTN bearing?", "a": "A 61820-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61820-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61820?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6820ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×125×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61820 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6820ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-zz", "6820zz", "61820-ZZ", "6820ZZ", "61820-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61920-NTN", "brand": "NTN", "manufacturer_designation": "6920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61920-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61920 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61920-NTN drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61920 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920 on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Order the C3 internal-clearance version (61920 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61920 is listed." ], "faq": [ { "q": "What are the dimensions of a 61920-NTN bearing?", "a": "A 61920-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61920-NTN need?", "a": "The open 61920-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61920?", "a": "NTN lists the open 61920 under the bare designation 6920; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Is 6920 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6920", "61920", "61920-NTN" ], "locale_variants": {} }, { "sku": "61920-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6920LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6920LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61920-2RS-NTN runs slower and cooler-limited than the open 61920; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61920-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61920-2RS-NTN.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 61920-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6920LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920LLU on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61920-2RS-NTN bearing?", "a": "A 61920-2RS-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61920-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61920-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6920LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-llu", "6920llu", "61920-2RS", "61920-2rs", "6920LLU", "61920-2RS-NTN" ], "locale_variants": {} }, { "sku": "61920-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6920LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61920-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6920LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 61920-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61920-RSR-NTN run faster than contact-seal 61920-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61920-2RS instead.", "The low-drag lip of 61920-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61920-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6920LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920LLB on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61920 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61920-RSR-NTN bearing?", "a": "A 61920-RSR-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6920LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-llb", "6920llb", "61920-RSR", "61920-rsr", "6920LLB", "61920-RSR-NTN" ], "locale_variants": {} }, { "sku": "61920-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6920ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 45.5, "static_load_kN": 39.5, "fatigue_load_limit_kN": 2.44, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 785, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61920-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6920ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61920-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61920-2RS for that.", "Shielded 61920-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6920ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 61920 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4500 r/min for 61920; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61920 at 45.5 kN dynamic (C) and 39.5 kN static (C0), 2.44 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 785 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 45.5/39.5 kN load ratings, 2.44 kN fatigue load limit Cu NTN lists the grease limiting speed at 4500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 785 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6920ZZ on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61920 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61920-ZZ-NTN bearing?", "a": "A 61920-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61920-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61920?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6920ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×140×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61920 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6920ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61920-zz", "6920zz", "61920-ZZ", "6920ZZ", "61920-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16020", "brand": "NTN", "manufacturer_designation": "16020", "series": "16000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.18, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 910, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16020 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 20 by five gives the 100 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 16020 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 100 mm bore shares the 150 mm outside diameter of the 6020 but is only 16 mm wide; a 6020 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16020 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16020.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16020 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 16020 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4200 r/min for 16020; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16020 at 39 kN dynamic (C) and 36.5 kN static (C0), 2.18 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 910 g, 16020 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 100×150×16 mm envelope of 16020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 39/36.5 kN load ratings, 2.18 kN fatigue load limit Cu NTN lists the grease limiting speed at 4200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16020 on the 100×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16020 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 16020 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16020 bearing?", "a": "A 16020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 16 mm width (3.937 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 16020 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 16020 need?", "a": "The open 16020 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 16020?", "a": "NTN lists the open 16020 under the bare designation 16020; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "Is 16020 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16020" ], "locale_variants": {} }, { "sku": "6220-NTN", "brand": "NTN", "manufacturer_designation": "6220", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6220 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6220 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6220-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6220-NTN.", "The open 6220 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220 on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6220-NTN bearing?", "a": "A 6220-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6220-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6220-NTN need?", "a": "The open 6220-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6220?", "a": "NTN lists the open 6220 under the bare designation 6220; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "What cage does NTN fit in 6220?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220", "6220-NTN" ], "locale_variants": {} }, { "sku": "6220-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6220LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6220-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6220LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 6220-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6220-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6220-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6220LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220LLU on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Order the C3 internal-clearance version (6220 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6220 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS-NTN bearing?", "a": "A 6220-2RS-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6220-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6220-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "Is 6220LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-llu", "6220llu", "6220-2RS", "6220-2rs", "6220LLU", "6220-2RS-NTN" ], "locale_variants": {} }, { "sku": "6220-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6220LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6220LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6220 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6220-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6220-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6220LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220LLB on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6220-RSR-NTN bearing?", "a": "A 6220-RSR-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6220-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6220-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "Does NTN offer 6220 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6220LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-llb", "6220llb", "6220-RSR", "6220-rsr", "6220LLB", "6220-RSR-NTN" ], "locale_variants": {} }, { "sku": "6220-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6220ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 135, "static_load_kN": 93, "fatigue_load_limit_kN": 6.15, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 3140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6220ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Do not wash 6220-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6220-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6220ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 6220 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6220; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 135 kN dynamic load rating (C) and 93 kN static (C0), 6.15 kN fatigue load limit Cu, 6220 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3140 g (3.1 kg), 6220 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 135/93 kN load ratings, 6.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3140 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6220ZZ on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive.", "Order the C3 internal-clearance version (6220 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6220 is listed." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ-NTN bearing?", "a": "A 6220-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6220-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6220?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6220ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×180×34 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6220ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6220-zz", "6220zz", "6220-ZZ", "6220ZZ", "6220-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6320-NTN", "brand": "NTN", "manufacturer_designation": "6320", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "The open 6320-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6320 units.", "Never mix components between two 6320-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6320 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320 on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6320 is listed." ], "faq": [ { "q": "What are the dimensions of a 6320-NTN bearing?", "a": "A 6320-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6320?", "a": "NTN lists the open 6320 under the bare designation 6320; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 100 mm bore envelope." }, { "q": "What cage does NTN fit in 6320?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320", "6320-NTN" ], "locale_variants": {} }, { "sku": "6320-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6320LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6320-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6320LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Contact seals add drag and heat: 6320-2RS-NTN runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6320-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6320-2RS-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 47 mm-wide ring of 6320-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6320LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320LLU on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6320 is listed.", "Order the C3 internal-clearance version (6320 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS-NTN bearing?", "a": "A 6320-2RS-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-llu", "6320llu", "6320-2RS", "6320-2rs", "6320LLU", "6320-2RS-NTN" ], "locale_variants": {} }, { "sku": "6320-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6320LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6320-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6320LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 100 mm bore gains dynamic rating through larger rolling elements on a 215 mm OD; the penalty is mass and a lower limiting speed than the 6220 — do not specify it for speed-critical shafts.", "The low-drag lip of 6320-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6320-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6320LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320LLB on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6320-RSR-NTN bearing?", "a": "A 6320-RSR-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6320-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 6320-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6320 and verify the residual clearance after mounting." }, { "q": "How should 6320-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-llb", "6320llb", "6320-RSR", "6320-rsr", "6320LLB", "6320-RSR-NTN" ], "locale_variants": {} }, { "sku": "6320-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6320ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 192, "static_load_kN": 141, "fatigue_load_limit_kN": 8.75, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6320ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 100 mm of 6320-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Do not wash 6320-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6320-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6320-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "NTN catalogues the shielded version as 6320ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 100 mm bore 6320 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6320; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 192 kN dynamic load rating (C) and 141 kN static (C0), 8.75 kN fatigue load limit Cu, 6320 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7000 g (7.0 kg), 6320 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 192/141 kN load ratings, 8.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6320ZZ on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive.", "Order the C3 internal-clearance version (6320 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ-NTN bearing?", "a": "A 6320-ZZ-NTN deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6320?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6320ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 100×215×47 mm ISO 15 envelope." }, { "q": "Does NTN offer 6320 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6320ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6320-zz", "6320zz", "6320-ZZ", "6320ZZ", "6320-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61821-NTN", "brand": "NTN", "manufacturer_designation": "6821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61821 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 105 mm of 61821-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61821-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61821-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61821 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821 on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61821 is listed." ], "faq": [ { "q": "What are the dimensions of a 61821-NTN bearing?", "a": "A 61821-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61821 mean?", "a": "A bare 61821 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61821?", "a": "NTN lists the open 61821 under the bare designation 6821; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6821", "61821", "61821-NTN" ], "locale_variants": {} }, { "sku": "61821-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6821LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6821LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61821 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 105 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6221.", "Contact seals add drag and heat: 61821-2RS-NTN runs slower and cooler-limited than the open 61821; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61821-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6821LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821LLU on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "Order the C3 internal-clearance version (61821 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS-NTN bearing?", "a": "A 61821-2RS-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61821-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61821-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "How should 61821-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61821?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6821LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×130×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-llu", "6821llu", "61821-2RS", "61821-2rs", "6821LLU", "61821-2RS-NTN" ], "locale_variants": {} }, { "sku": "61821-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6821ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22, "static_load_kN": 22, "fatigue_load_limit_kN": 1.35, "limiting_speed_rpm": 4600, "max_rpm": 4600, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61821-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6821ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Do not wash 61821-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61821-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61821-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6821ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 61821 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4600 r/min for 61821; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 22 kN dynamic load rating (C) and 22 kN static (C0), 1.35 kN fatigue load limit Cu, 61821 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 330 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 22/22 kN load ratings, 1.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 4600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 330 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6821ZZ on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive.", "Standard catalogue stock of 61821 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61821-ZZ-NTN bearing?", "a": "A 61821-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61821-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61821-ZZ-NTN need?", "a": "61821-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61821?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6821ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×130×13 mm ISO 15 envelope." }, { "q": "Does NTN offer 61821 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6821ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-zz", "6821zz", "61821-ZZ", "6821ZZ", "61821-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61921-NTN", "brand": "NTN", "manufacturer_designation": "6921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 105 mm of 61921-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61921-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-NTN drags the lip and overheats it.", "The open 61921 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921 on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Standard catalogue stock of 61921 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61921-NTN bearing?", "a": "A 61921-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61921 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61921 uses the same ISO 15 envelope (105×145×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61921?", "a": "NTN lists the open 61921 under the bare designation 6921; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "What cage does NTN fit in 6921?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6921", "61921", "61921-NTN" ], "locale_variants": {} }, { "sku": "61921-2RS", "brand": "NTN", "manufacturer_designation": "6921LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6921LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61921 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61921-2RS runs slower and cooler-limited than the open 61921; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61921-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6921LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2500 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLU on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61921-2RS bearing?", "a": "A 61921-2RS deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61921-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6921LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llu", "6921llu", "61921-2RS", "61921-2rs", "6921LLU" ], "locale_variants": {} }, { "sku": "61921-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6921LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61921-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6921LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61921-RSR-NTN run faster than contact-seal 61921-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61921-2RS instead.", "The low-drag lip of 61921-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 145 mm OD should be round within IT7; an oval bore pinches the outer ring of 61921-RSR-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6921LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLB on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61921 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61921-RSR-NTN bearing?", "a": "A 61921-RSR-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61921-RSR-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61921-RSR-NTN need?", "a": "61921-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61921 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61921 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6921LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llb", "6921llb", "61921-RSR", "61921-rsr", "6921LLB", "61921-RSR-NTN" ], "locale_variants": {} }, { "sku": "61921-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6921ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 47, "static_load_kN": 42, "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6921ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61921 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61921-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61921-2RS for that.", "Shielded 61921-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-ZZ-NTN drags the lip and overheats it.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6921ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 61921 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61921; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61921 at 47 kN dynamic (C) and 42 kN static (C0), 2.52 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 816 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921ZZ on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61921 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61921-ZZ-NTN bearing?", "a": "A 61921-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61921-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61921-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61921 and verify the residual clearance after mounting." }, { "q": "How should 61921-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61921?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6921ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×145×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61921 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6921ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-zz", "6921zz", "61921-ZZ", "6921ZZ", "61921-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16021", "brand": "NTN", "manufacturer_designation": "16021", "series": "16000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 57.5, "static_load_kN": 50.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 105 mm of 16021 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 105 mm bore shares the 160 mm outside diameter of the 6021 but is only 18 mm wide; a 6021 in a 18 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16021 units.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16021 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 16021 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 16021; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16021 at 57.5 kN dynamic (C) and 50.5 kN static (C0), 3 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1200 g (1.2 kg), 16021 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×160×18 mm envelope of 16021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 57.5/50.5 kN load ratings, 3 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16021 on the 105×160×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16021 in a rated drive.", "Order the C3 internal-clearance version (16021 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16021 bearing?", "a": "A 16021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 18 mm width (4.134 × 6.299 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16021 need?", "a": "The open 16021 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16021 bore code work?", "a": "The last two digits of 16021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16021?", "a": "NTN lists the open 16021 under the bare designation 16021; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Is 16021 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16021" ], "locale_variants": {} }, { "sku": "6221-NTN", "brand": "NTN", "manufacturer_designation": "6221", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6221 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 105 mm bore the 62xx light series is the workhorse section; its 190×36 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6221-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6221 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221 on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6221 is listed." ], "faq": [ { "q": "What are the dimensions of a 6221-NTN bearing?", "a": "A 6221-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6221-NTN have?", "a": "Unless a clearance suffix says otherwise, 6221-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting." }, { "q": "How should 6221-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6221?", "a": "NTN lists the open 6221 under the bare designation 6221; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Is 6221 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221", "6221-NTN" ], "locale_variants": {} }, { "sku": "6221-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6221LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6221LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 105 mm of 6221-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6221-2RS-NTN runs slower and cooler-limited than the open 6221; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6221-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-2RS-NTN.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6221-2RS-NTN.", "NTN catalogues the contact-sealed version as 6221LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2300 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221LLU on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6221 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6221-2RS-NTN bearing?", "a": "A 6221-2RS-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6221-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-llu", "6221llu", "6221-2RS", "6221-2rs", "6221LLU", "6221-2RS-NTN" ], "locale_variants": {} }, { "sku": "6221-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6221LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6221-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 190 mm outside diameter and 36 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6221LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 6221-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6221-RSR-NTN run faster than contact-seal 6221-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6221-2RS instead.", "The low-drag lip of 6221-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues this low-friction non-contact seal as 6221LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221LLB on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6221 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6221-RSR-NTN bearing?", "a": "A 6221-RSR-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6221-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-llb", "6221llb", "6221-RSR", "6221-rsr", "6221LLB", "6221-RSR-NTN" ], "locale_variants": {} }, { "sku": "6221-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6221ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 147, "static_load_kN": 105, "fatigue_load_limit_kN": 6.75, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6221ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 6221-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Do not wash 6221-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6221-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6221ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 6221 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3400 r/min for 6221; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 147 kN dynamic load rating (C) and 105 kN static (C0), 6.75 kN fatigue load limit Cu, 6221 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3700 g (3.7 kg), 6221 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 147/105 kN load ratings, 6.75 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6221ZZ on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive.", "Standard catalogue stock of 6221 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ-NTN bearing?", "a": "A 6221-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6221-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6221?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6221ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×190×36 mm ISO 15 envelope." }, { "q": "Is 6221ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6221-zz", "6221zz", "6221-ZZ", "6221ZZ", "6221-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6321-NTN", "brand": "NTN", "manufacturer_designation": "6321", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6321 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6321-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "The open 6321-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6321 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321 on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "Standard catalogue stock of 6321 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6321 is listed." ], "faq": [ { "q": "What are the dimensions of a 6321-NTN bearing?", "a": "A 6321-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6321 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6321 uses the same ISO 15 envelope (105×225×49 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6321?", "a": "NTN lists the open 6321 under the bare designation 6321; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 105 mm bore envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321", "6321-NTN" ], "locale_variants": {} }, { "sku": "6321-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6321LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6321-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6321LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6321 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6321-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6321-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 49 mm-wide ring of 6321-2RS-NTN drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6321LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321LLU on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6321 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6321-2RS-NTN bearing?", "a": "A 6321-2RS-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6321-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6321-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6321 and verify the residual clearance after mounting." }, { "q": "How should 6321-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6321?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6321LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×225×49 mm ISO 15 envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321-llu", "6321llu", "6321-2RS", "6321-2rs", "6321LLU", "6321-2RS-NTN" ], "locale_variants": {} }, { "sku": "6321-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6321ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 204, "static_load_kN": 153, "fatigue_load_limit_kN": 9.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6321ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 105 mm of 6321-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.", "Do not wash 6321-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6321-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6321ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 105 mm bore 6321 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3000 r/min for 6321; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 204 kN dynamic load rating (C) and 153 kN static (C0), 9.35 kN fatigue load limit Cu, 6321 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8050 g (8.1 kg), 6321 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 204/153 kN load ratings, 9.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6321ZZ on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive.", "Order the C3 internal-clearance version (6321 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ-NTN bearing?", "a": "A 6321-ZZ-NTN deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6321-ZZ-NTN need?", "a": "6321-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6321?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6321ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 105×225×49 mm ISO 15 envelope." }, { "q": "Does NTN offer 6321 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6321ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6321-zz", "6321zz", "6321-ZZ", "6321ZZ", "6321-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61822-NTN", "brand": "NTN", "manufacturer_designation": "6822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 61822-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "The open 61822-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61822-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822-NTN.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61822 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822 on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61822 is listed.", "Order the C3 internal-clearance version (61822 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61822-NTN bearing?", "a": "A 61822-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61822-NTN have?", "a": "Unless a clearance suffix says otherwise, 61822-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "How should 61822-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61822?", "a": "NTN lists the open 61822 under the bare designation 6822; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "What cage does NTN fit in 6822?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6822", "61822", "61822-NTN" ], "locale_variants": {} }, { "sku": "61822-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6822LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61822-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6822LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61822 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "Heat is the enemy of the sealed 61822-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61822-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6822LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822LLU on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61822 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS-NTN bearing?", "a": "A 61822-2RS-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61822-2RS-NTN need?", "a": "61822-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61822 with a housing grease fitting instead." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6822LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-llu", "6822llu", "61822-2RS", "61822-2rs", "6822LLU", "61822-2RS-NTN" ], "locale_variants": {} }, { "sku": "61822-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6822LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6822LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 61822-RSR-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "RSR low-friction seals on 61822-RSR-NTN run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The low-drag lip of 61822-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6822LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822LLB on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Standard catalogue stock of 61822 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR-NTN bearing?", "a": "A 61822-RSR-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61822 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61822 uses the same ISO 15 envelope (110×140×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61822-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61822-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "Does NTN offer 61822 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6822LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "full", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-llb", "6822llb", "61822-RSR", "61822-rsr", "6822LLB", "61822-RSR-NTN" ], "locale_variants": {} }, { "sku": "61822-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6822ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.5, "static_load_kN": 28.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61822-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6822ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 61822-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "ZZ shields are non-contact: 61822-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61822-2RS for that.", "Shielded 61822-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61822-ZZ-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6822ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 61822 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4300 r/min for 61822; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 27.5 kN dynamic load rating (C) and 28.2 kN static (C0), 1.68 kN fatigue load limit Cu, 61822 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 515 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 27.5/28.2 kN load ratings, 1.68 kN fatigue load limit Cu NTN lists the grease limiting speed at 4300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 515 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6822ZZ on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive.", "Order the C3 internal-clearance version (61822 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61822-ZZ-NTN bearing?", "a": "A 61822-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61822-ZZ-NTN need?", "a": "61822-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61822?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6822ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×140×16 mm ISO 15 envelope." }, { "q": "Is 6822ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61822-zz", "6822zz", "61822-ZZ", "6822ZZ", "61822-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61922-NTN", "brand": "NTN", "manufacturer_designation": "6922", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61922 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61922-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61922 units.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61922 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922 on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61922-NTN bearing?", "a": "A 61922-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61922-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61922-NTN need?", "a": "The open 61922-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61922?", "a": "NTN lists the open 61922 under the bare designation 6922; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "What cage does NTN fit in 6922?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6922", "61922", "61922-NTN" ], "locale_variants": {} }, { "sku": "61922-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6922LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61922-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 150 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6922LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 61922 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61922-2RS-NTN runs slower and cooler-limited than the open 61922; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61922-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61922-2RS-NTN.", "NTN catalogues the contact-sealed version as 6922LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2400 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922LLU on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61922 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61922-2RS-NTN bearing?", "a": "A 61922-2RS-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61922-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "Is 6922LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-llu", "6922llu", "61922-2RS", "61922-2rs", "6922LLU", "61922-2RS-NTN" ], "locale_variants": {} }, { "sku": "61922-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6922LLB", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6922LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61922-RSR-NTN run faster than contact-seal 61922-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61922-2RS instead.", "The low-drag lip of 61922-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6922LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922LLB on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61922 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61922-RSR-NTN bearing?", "a": "A 61922-RSR-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61922-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6922LLB?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-llb", "6922llb", "61922-RSR", "61922-rsr", "6922LLB", "61922-RSR-NTN" ], "locale_variants": {} }, { "sku": "61922-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6922ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4100, "max_rpm": 4100, "weight_g": 849, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6922ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 110 mm of 61922-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Do not wash 61922-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61922-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61922-ZZ-NTN.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61922-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6922ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 61922 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4100 r/min for 61922; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61922 at 48.5 kN dynamic (C) and 44.5 kN static (C0), 2.6 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 849 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 48.5/44.5 kN load ratings, 2.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 4100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 849 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6922ZZ on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive.", "Standard catalogue stock of 61922 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61922-ZZ-NTN bearing?", "a": "A 61922-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61922-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61922?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6922ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×150×20 mm ISO 15 envelope." }, { "q": "Does NTN offer 61922 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6922ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61922-zz", "6922zz", "61922-ZZ", "6922ZZ", "61922-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16022", "brand": "NTN", "manufacturer_designation": "16022", "series": "16000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 63.5, "static_load_kN": 56.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 110 mm of 16022 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 170 mm OD of the 6022 at 110 mm bore but is only 19 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16022 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 16022 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16022-C3. No clearance suffix means normal CN clearance.", "The open 16022 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 16022 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 16022; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16022 at 63.5 kN dynamic (C) and 56.5 kN static (C0), 3.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1460 g (1.5 kg), 16022 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×170×19 mm envelope of 16022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 63.5/56.5 kN load ratings, 3.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1460 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16022 on the 110×170×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16022 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16022 is listed." ], "faq": [ { "q": "What are the dimensions of a 16022 bearing?", "a": "A 16022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 19 mm width (4.331 × 6.693 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16022 mean?", "a": "A bare 16022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 110 mm bore?", "a": "160 is the narrow extra-light section: 170×19 mm with a 30.0 mm radial section at 110 mm bore. It has the same bore and outside diameter as the 6022 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16022?", "a": "NTN lists the open 16022 under the bare designation 16022; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Does NTN offer 16022 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16022 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16022" ], "locale_variants": {} }, { "sku": "6222-NTN", "brand": "NTN", "manufacturer_designation": "6222", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6222-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6222-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6222-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6222 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222 on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6222 is listed." ], "faq": [ { "q": "What are the dimensions of a 6222-NTN bearing?", "a": "A 6222-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6222-NTN have?", "a": "Unless a clearance suffix says otherwise, 6222-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6222?", "a": "NTN lists the open 6222 under the bare designation 6222; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Is 6222 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222", "6222-NTN" ], "locale_variants": {} }, { "sku": "6222-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6222LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6222-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6222LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6222-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6222-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6222LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222LLU on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Standard catalogue stock of 6222 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS-NTN bearing?", "a": "A 6222-2RS-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6222LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-llu", "6222llu", "6222-2RS", "6222-2rs", "6222LLU", "6222-2RS-NTN" ], "locale_variants": {} }, { "sku": "6222-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6222LLB", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6222LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6222-RSR-NTN run faster than contact-seal 6222-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6222-2RS instead.", "The non-contact lip of 6222-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6222-RSR-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues this low-friction non-contact seal as 6222LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222LLB on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6222-RSR-NTN bearing?", "a": "A 6222-RSR-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6222-RSR-NTN need?", "a": "6222-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6222 with a housing grease fitting instead." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "Does NTN offer 6222 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6222LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-llb", "6222llb", "6222-RSR", "6222-rsr", "6222LLB", "6222-RSR-NTN" ], "locale_variants": {} }, { "sku": "6222-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6222ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 160, "static_load_kN": 117, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6222ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 110 mm of 6222-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Do not wash 6222-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6222-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6222ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 6222 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3200 r/min for 6222; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 160 kN dynamic load rating (C) and 117 kN static (C0), 7.35 kN fatigue load limit Cu, 6222 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4360 g (4.4 kg), 6222 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 160/117 kN load ratings, 7.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4360 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6222ZZ on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 6222 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ-NTN bearing?", "a": "A 6222-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6222-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6222-ZZ-NTN need?", "a": "6222-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6222?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6222ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×200×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6222ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6222-zz", "6222zz", "6222-ZZ", "6222ZZ", "6222-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6322-NTN", "brand": "NTN", "manufacturer_designation": "6322", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The open 6322-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6322-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6322 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322 on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Order the C3 internal-clearance version (6322 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6322-NTN bearing?", "a": "A 6322-NTN deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6322-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6322-NTN need?", "a": "The open 6322-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6322?", "a": "NTN lists the open 6322 under the bare designation 6322; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 110 mm bore envelope." }, { "q": "Does NTN offer 6322 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6322 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322", "6322-NTN" ], "locale_variants": {} }, { "sku": "6322-2RS", "brand": "NTN", "manufacturer_designation": "6322LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6322LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 6322-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "Contact seals add drag and heat: 6322-2RS runs slower and cooler-limited than the open 6322; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6322-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6322-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6322LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 1900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLU on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6322-2RS bearing?", "a": "A 6322-2RS deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6322-2RS need?", "a": "6322-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6322 with a housing grease fitting instead." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Does NTN offer 6322 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6322LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llu", "6322llu", "6322-2RS", "6322-2rs", "6322LLU" ], "locale_variants": {} }, { "sku": "6322-RSR", "brand": "NTN", "manufacturer_designation": "6322LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6322-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6322LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The low-drag lip of 6322-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6322-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6322LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLB on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Order the C3 internal-clearance version (6322 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6322-RSR bearing?", "a": "A 6322-RSR deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6322 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6322 uses the same ISO 15 envelope (110×240×50 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6322-RSR have?", "a": "Unless a clearance suffix says otherwise, 6322-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6322 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Is 6322LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llb", "6322llb", "6322-RSR", "6322-rsr", "6322LLB" ], "locale_variants": {} }, { "sku": "6322-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6322ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6322ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6322-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6322-2RS for that.", "Shielded 6322-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6322ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 110 mm bore 6322 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6322; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 227 kN dynamic load rating (C) and 179 kN static (C0), 10.5 kN fatigue load limit Cu, 6322 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9540 g (9.5 kg), 6322 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322ZZ on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive.", "Standard catalogue stock of 6322 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6322-ZZ-NTN bearing?", "a": "A 6322-ZZ-NTN deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6322-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 6322?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6322ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 110×240×50 mm ISO 15 envelope." }, { "q": "Is 6322ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-zz", "6322zz", "6322-ZZ", "6322ZZ", "6322-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61824-NTN", "brand": "NTN", "manufacturer_designation": "6824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61824 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "Storage matters for open bearings: 61824-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61824 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824 on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61824 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61824-NTN bearing?", "a": "A 61824-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61824 mean?", "a": "A bare 61824 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61824?", "a": "NTN lists the open 61824 under the bare designation 6824; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "Does NTN offer 61824 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6824 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6824", "61824", "61824-NTN" ], "locale_variants": {} }, { "sku": "61824-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6824LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6824LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Contact seals add drag and heat: 61824-2RS-NTN runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61824-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-2RS-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6824LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2200 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824LLU on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS-NTN bearing?", "a": "A 61824-2RS-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61824-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "Is 6824LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-llu", "6824llu", "61824-2RS", "61824-2rs", "6824LLU", "61824-2RS-NTN" ], "locale_variants": {} }, { "sku": "61824-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6824LLB", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6824LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR-NTN run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The low-drag lip of 61824-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-RSR-NTN drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues this low-friction non-contact seal as 6824LLB (suffix LB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824LLB on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61824 is listed." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR-NTN bearing?", "a": "A 61824-RSR-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61824-RSR-NTN have?", "a": "Unless a clearance suffix says otherwise, 61824-RSR-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "Is 6824LLB a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-llb", "6824llb", "61824-RSR", "61824-rsr", "6824LLB", "61824-RSR-NTN" ], "locale_variants": {} }, { "sku": "61824-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6824ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32, "static_load_kN": 33, "fatigue_load_limit_kN": 1.89, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 555, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6824ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 120 mm of 61824-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Do not wash 61824-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61824-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-ZZ-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6824ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 61824 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 4000 r/min for 61824; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 32 kN dynamic load rating (C) and 33 kN static (C0), 1.89 kN fatigue load limit Cu, 61824 is a medium-load bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NTN catalogue.", "At 555 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 32/33 kN load ratings, 1.89 kN fatigue load limit Cu NTN lists the grease limiting speed at 4000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 555 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6824ZZ on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61824 is listed.", "Standard catalogue stock of 61824 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61824-ZZ-NTN bearing?", "a": "A 61824-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61824?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6824ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×150×16 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6824ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-zz", "6824zz", "61824-ZZ", "6824ZZ", "61824-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61924-NTN", "brand": "NTN", "manufacturer_designation": "6924", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61924-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 61924-NTN drags the lip and overheats it.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61924 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924 on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61924 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61924-NTN bearing?", "a": "A 61924-NTN deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61924-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61924-NTN need?", "a": "The open 61924-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61924?", "a": "NTN lists the open 61924 under the bare designation 6924; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6924?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6924", "61924", "61924-NTN" ], "locale_variants": {} }, { "sku": "61924-2RS", "brand": "NTN", "manufacturer_designation": "6924LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6924LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61924-2RS runs slower and cooler-limited than the open 61924; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61924-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61924-C3. No clearance suffix means normal CN clearance.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6924LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924LLU on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Standard catalogue stock of 61924 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61924 is listed." ], "faq": [ { "q": "What are the dimensions of a 61924-2RS bearing?", "a": "A 61924-2RS deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61924-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61924-2RS need?", "a": "61924-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61924 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61924?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6924LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×165×22 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6924LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-llu", "6924llu", "61924-2RS", "61924-2rs", "6924LLU" ], "locale_variants": {} }, { "sku": "61924-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6924ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 59, "static_load_kN": 54, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61924-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6924ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 120 mm of 61924-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61924-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61924-2RS for that.", "Shielded 61924-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61924-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 165 mm OD should be round within IT7; an oval bore pinches the outer ring of 61924-ZZ-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the shielded version as 6924ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 61924 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3800 r/min for 61924; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61924 at 59 kN dynamic (C) and 54 kN static (C0), 3.05 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1150 g (1.1 kg), 61924 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 3800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924ZZ on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61924-ZZ-NTN bearing?", "a": "A 61924-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61924-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61924?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6924ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×165×22 mm ISO 15 envelope." }, { "q": "Does NTN offer 61924 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6924ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-zz", "6924zz", "61924-ZZ", "6924ZZ", "61924-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6024-NTN", "brand": "NTN", "manufacturer_designation": "6024", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 120 mm of 6024-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "The open 6024-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6024-NTN.", "Never mix components between two 6024-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6024 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024 on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6024-NTN bearing?", "a": "A 6024-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6024 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6024 uses the same ISO 15 envelope (120×180×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6024?", "a": "NTN lists the open 6024 under the bare designation 6024; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6024?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024", "6024-NTN" ], "locale_variants": {} }, { "sku": "6024-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6024LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6024LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6024-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6024-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6024LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2100 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024LLU on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS-NTN bearing?", "a": "A 6024-2RS-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6024 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6024 uses the same ISO 15 envelope (120×180×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6024LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-llu", "6024llu", "6024-2RS", "6024-2rs", "6024LLU", "6024-2RS-NTN" ], "locale_variants": {} }, { "sku": "6024-RSR-NTN", "brand": "NTN", "manufacturer_designation": "6024LLB", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6024LLB), mapped here from the industry-neutral -RSR spelling; speed capability matches the open bearing but it is not liquid-tight.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6024-RSR-NTN barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6024-RSR-NTN does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-RSR-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues this low-friction non-contact seal as 6024LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024LLB on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6024 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6024-RSR-NTN bearing?", "a": "A 6024-RSR-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6024-RSR-NTN need?", "a": "6024-RSR-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6024 with a housing grease fitting instead." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024LLB), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6024 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6024LLB is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-llb", "6024llb", "6024-RSR", "6024-rsr", "6024LLB", "6024-RSR-NTN" ], "locale_variants": {} }, { "sku": "6024-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6024ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6024-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 180 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6024ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 120 mm of 6024-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Do not wash 6024-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6024-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6024-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6024ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6024 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 3500 r/min for 6024; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 79.5 kN static (C0), 4.65 kN fatigue load limit Cu, 6024 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2070 g (2.1 kg), 6024 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/79.5 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6024ZZ on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive.", "Standard catalogue stock of 6024 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ-NTN bearing?", "a": "A 6024-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6024-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6024?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6024ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×180×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 6024 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6024ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6024-zz", "6024zz", "6024-ZZ", "6024ZZ", "6024-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6224-NTN", "brand": "NTN", "manufacturer_designation": "6224", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6224 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 40 mm-wide ring of 6224-NTN drags the lip and overheats it.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6224 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224 on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "Standard catalogue stock of 6224 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6224-NTN bearing?", "a": "A 6224-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6224-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6224-NTN need?", "a": "The open 6224-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6224?", "a": "NTN lists the open 6224 under the bare designation 6224; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6224?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224", "6224-NTN" ], "locale_variants": {} }, { "sku": "6224-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6224LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6224LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6224-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6224-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6224-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-2RS-NTN.", "NTN catalogues the contact-sealed version as 6224LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2000 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224LLU on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6224 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS-NTN bearing?", "a": "A 6224-2RS-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6224-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6224-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6224?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6224LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×215×40 mm ISO 15 envelope." }, { "q": "Is 6224LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-llu", "6224llu", "6224-2RS", "6224-2rs", "6224LLU", "6224-2RS-NTN" ], "locale_variants": {} }, { "sku": "6224-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6224ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 131, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 5150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6224-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6224ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Do not wash 6224-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6224-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6224-ZZ-NTN.", "NTN catalogues the shielded version as 6224ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6224 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2900 r/min for 6224; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 172 kN dynamic load rating (C) and 131 kN static (C0), 7.95 kN fatigue load limit Cu, 6224 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5150 g (5.2 kg), 6224 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 172/131 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6224ZZ on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive.", "Order the C3 internal-clearance version (6224 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6224 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ-NTN bearing?", "a": "A 6224-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6224-ZZ-NTN need?", "a": "6224-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6224?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6224ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×215×40 mm ISO 15 envelope." }, { "q": "Does NTN offer 6224 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6224ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-zz", "6224zz", "6224-ZZ", "6224ZZ", "6224-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6324-NTN", "brand": "NTN", "manufacturer_designation": "6324", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6324 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 120 mm bore the ring mass is significant: heat 6324 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.", "The open 6324-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 120×260×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6324-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 55 mm-wide ring of 6324-NTN drags the lip and overheats it.", "The open 6324 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324 on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6324 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6324-NTN bearing?", "a": "A 6324-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6324?", "a": "NTN lists the open 6324 under the bare designation 6324; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 120 mm bore envelope." }, { "q": "What cage does NTN fit in 6324?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324", "6324-NTN" ], "locale_variants": {} }, { "sku": "6324-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6324LLU", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6324-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6324LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Contact seals add drag and heat: 6324-2RS-NTN runs slower and cooler-limited than the open 6324; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6324-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324-2RS-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6324LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 1700 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324LLU on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "Order the C3 internal-clearance version (6324 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6324 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS-NTN bearing?", "a": "A 6324-2RS-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6324?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6324LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×260×55 mm ISO 15 envelope." }, { "q": "Does NTN offer 6324 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6324LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324-llu", "6324llu", "6324-2RS", "6324-2rs", "6324LLU", "6324-2RS-NTN" ], "locale_variants": {} }, { "sku": "6324-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6324ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 185, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 12400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6324ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 120 mm of 6324-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6324-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 55 mm-wide ring of 6324-ZZ-NTN drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6324ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "At 120 mm bore 6324 is in NTN's medium industrial range; the pressed-steel cage is standard but large-section 63xx/64xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NTN channel if the application sees impact loads.", "NTN lists the grease limiting speed at 2600 r/min for 6324; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 229 kN dynamic load rating (C) and 185 kN static (C0), 10.5 kN fatigue load limit Cu, 6324 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12400 g (12.4 kg), 6324 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 229/185 kN load ratings, 10.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6324ZZ on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6324 is listed." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ-NTN bearing?", "a": "A 6324-ZZ-NTN deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6324-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6324-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6324 and verify the residual clearance after mounting." }, { "q": "How should 6324-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6324?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6324ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 120×260×55 mm ISO 15 envelope." }, { "q": "Does NTN offer 6324 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6324ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6324-zz", "6324zz", "6324-ZZ", "6324ZZ", "6324-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61826-NTN", "brand": "NTN", "manufacturer_designation": "6826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61826 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "The open 61826-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61826-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61826 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3700 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826 on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61826 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61826-NTN bearing?", "a": "A 61826-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61826-NTN need?", "a": "The open 61826-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61826?", "a": "NTN lists the open 61826 under the bare designation 6826; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Does NTN offer 61826 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6826 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6826", "61826", "61826-NTN" ], "locale_variants": {} }, { "sku": "61826-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6826LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6826LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 130 mm of 61826-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "Contact seals add drag and heat: 61826-2RS-NTN runs slower and cooler-limited than the open 61826; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61826-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61826-2RS-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6826LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826LLU on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61826 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS-NTN bearing?", "a": "A 61826-2RS-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61826-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61826-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting." }, { "q": "How should 61826-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61826?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6826LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×165×18 mm ISO 15 envelope." }, { "q": "Does NTN offer 61826 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6826LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61826-llu", "6826llu", "61826-2RS", "61826-2rs", "6826LLU", "61826-2RS-NTN" ], "locale_variants": {} }, { "sku": "61826-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6826ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41, "static_load_kN": 41, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 3700, "max_rpm": 3700, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61826-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6826ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "ZZ shields are non-contact: 61826-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61826-2RS for that.", "Shielded 61826-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the shielded version as 6826ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 61826 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3700 r/min for 61826; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61826 at 41 kN dynamic (C) and 41 kN static (C0), 2.25 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 800 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 41/41 kN load ratings, 2.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6826ZZ on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61826 is listed." ], "faq": [ { "q": "What are the dimensions of a 61826-ZZ-NTN bearing?", "a": "A 61826-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61826 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61826-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61826-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61826?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6826ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×165×18 mm ISO 15 envelope." }, { "q": "Is 6826ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61826-zz", "6826zz", "61826-ZZ", "6826ZZ", "61826-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61926-NTN", "brand": "NTN", "manufacturer_designation": "6926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61926 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 180 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61926-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61926 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61926-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61926 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3500 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926 on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61926 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61926-NTN bearing?", "a": "A 61926-NTN deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61926 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61926 uses the same ISO 15 envelope (130×180×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61926-NTN have?", "a": "Unless a clearance suffix says otherwise, 61926-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61926 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61926?", "a": "NTN lists the open 61926 under the bare designation 6926; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6926 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6926", "61926", "61926-NTN" ], "locale_variants": {} }, { "sku": "61926-2RS", "brand": "NTN", "manufacturer_designation": "6926LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6926LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 130 mm of 61926-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61926-2RS runs slower and cooler-limited than the open 61926; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61926-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61926-2RS drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6926LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926LLU on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61926-2RS bearing?", "a": "A 61926-2RS deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61926-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61926?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6926LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×180×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 61926 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6926LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-llu", "6926llu", "61926-2RS", "61926-2rs", "6926LLU" ], "locale_variants": {} }, { "sku": "61926-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6926ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 72, "static_load_kN": 67.5, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 3500, "max_rpm": 3500, "weight_g": 1520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6926ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 130 mm of 61926-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61926-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61926-2RS for that.", "Do not wash 61926-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61926-ZZ-NTN.", "NTN catalogues the shielded version as 6926ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 61926 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3500 r/min for 61926; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 72 kN dynamic load rating (C) and 67.5 kN static (C0), 3.65 kN fatigue load limit Cu, 61926 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1520 g (1.5 kg), 61926 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 3500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926ZZ on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61926 is listed." ], "faq": [ { "q": "What are the dimensions of a 61926-ZZ-NTN bearing?", "a": "A 61926-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61926-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61926-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61926 and verify the residual clearance after mounting." }, { "q": "How should 61926-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61926?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6926ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×180×24 mm ISO 15 envelope." }, { "q": "Does NTN offer 61926 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6926ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-zz", "6926zz", "61926-ZZ", "6926ZZ", "61926-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16026-NTN", "brand": "NTN", "manufacturer_designation": "16026", "series": "16000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.5, "static_load_kN": 79.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 16026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Because the 160xx narrow section shares the 200 mm OD of the 6026 at 130 mm bore but is only 22 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16026-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16026 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16026-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16026 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 16026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 16026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 88.5 kN dynamic load rating (C) and 79.5 kN static (C0), 4.25 kN fatigue load limit Cu, 16026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2310 g (2.3 kg), 16026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×22 mm envelope of 16026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 88.5/79.5 kN load ratings, 4.25 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2310 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16026 on the 130×200×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16026 in a rated drive.", "Standard catalogue stock of 16026 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16026-NTN bearing?", "a": "A 16026-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 22 mm width (5.118 × 7.874 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16026 mean?", "a": "A bare 16026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 130 mm bore?", "a": "160 is the narrow extra-light section: 200×22 mm with a 35.0 mm radial section at 130 mm bore. It has the same bore and outside diameter as the 6026 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16026?", "a": "NTN lists the open 16026 under the bare designation 16026; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "What cage does NTN fit in 16026?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16026", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16026", "16026-NTN" ], "locale_variants": {} }, { "sku": "6026-NTN", "brand": "NTN", "manufacturer_designation": "6026", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6026 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Storage matters for open bearings: 6026-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6026 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026 on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6026-NTN bearing?", "a": "A 6026-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6026 mean?", "a": "A bare 6026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6026?", "a": "NTN lists the open 6026 under the bare designation 6026; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "What cage does NTN fit in 6026?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026", "6026-NTN" ], "locale_variants": {} }, { "sku": "6026-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6026LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6026LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 130 mm of 6026-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6026-2RS-NTN runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6026-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6026LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026LLU on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6026 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS-NTN bearing?", "a": "A 6026-2RS-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6026-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6026?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6026LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×200×33 mm ISO 15 envelope." }, { "q": "Is 6026LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026-llu", "6026llu", "6026-2RS", "6026-2rs", "6026LLU", "6026-2RS-NTN" ], "locale_variants": {} }, { "sku": "6026-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6026ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 118, "static_load_kN": 101, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6026-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6026ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6026-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.", "Shielded 6026-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6026ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 6026 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 6026; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 118 kN dynamic load rating (C) and 101 kN static (C0), 5.7 kN fatigue load limit Cu, 6026 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3160 g (3.2 kg), 6026 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 118/101 kN load ratings, 5.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6026ZZ on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6026 is listed." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ-NTN bearing?", "a": "A 6026-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN suffix for a sealed 6026?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6026ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×200×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6026ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6026-zz", "6026zz", "6026-ZZ", "6026ZZ", "6026-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6226-NTN", "brand": "NTN", "manufacturer_designation": "6226", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6226-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 230 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6226-NTN.", "The open 6226 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226 on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6226-NTN bearing?", "a": "A 6226-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the NTN order number for an open 6226?", "a": "NTN lists the open 6226 under the bare designation 6226; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6226 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226", "6226-NTN" ], "locale_variants": {} }, { "sku": "6226-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6226LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6226LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 130 mm of 6226-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6226-2RS-NTN runs slower and cooler-limited than the open 6226; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6226-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 230 mm OD should be round within IT7; an oval bore pinches the outer ring of 6226-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6226LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226LLU on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Order the C3 internal-clearance version (6226 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6226 is listed." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS-NTN bearing?", "a": "A 6226-2RS-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6226-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6226-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6226 and verify the residual clearance after mounting." }, { "q": "How should 6226-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6226?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6226LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×230×40 mm ISO 15 envelope." }, { "q": "Is 6226LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-llu", "6226llu", "6226-2RS", "6226-2rs", "6226LLU", "6226-2RS-NTN" ], "locale_variants": {} }, { "sku": "6226-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6226ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 185, "static_load_kN": 146, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 5820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6226-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6226ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6226-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6226-2RS for that.", "Shielded 6226-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 40 mm-wide ring of 6226-ZZ-NTN drags the lip and overheats it.", "NTN catalogues the shielded version as 6226ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 130 mm bore places 6226 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 6226; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 185 kN dynamic load rating (C) and 146 kN static (C0), 8.55 kN fatigue load limit Cu, 6226 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5820 g (5.8 kg), 6226 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 185/146 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5820 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6226ZZ on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive.", "Standard catalogue stock of 6226 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ-NTN bearing?", "a": "A 6226-ZZ-NTN deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6226-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6226-ZZ-NTN need?", "a": "6226-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 6226?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6226ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 130×230×40 mm ISO 15 envelope." }, { "q": "Does NTN offer 6226 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6226ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-zz", "6226zz", "6226-ZZ", "6226ZZ", "6226-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6326-NTN", "brand": "NTN", "manufacturer_designation": "6326", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 254, "static_load_kN": 214, "fatigue_load_limit_kN": 11.7, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 15300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6326 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 280 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 130 mm bore gains dynamic rating through larger rolling elements on a 280 mm OD; the penalty is mass and a lower limiting speed than the 6226 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6326-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6326-NTN.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6326 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 130 mm bore places 6326 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6326; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6326 at 254 kN dynamic (C) and 214 kN static (C0), 11.7 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15300 g (15.3 kg), 6326 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 130×280×58 mm envelope of 6326 gives a D/d ratio of 2.15 and 75.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 254/214 kN load ratings, 11.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6326 on the 130×280×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6326 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6326-NTN bearing?", "a": "A 6326-NTN deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6326 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6326 uses the same ISO 15 envelope (130×280×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6326?", "a": "NTN lists the open 6326 under the bare designation 6326; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 130 mm bore envelope." }, { "q": "Is 6326 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6326-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326", "equiv_brand": "SKF", "level": "full", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6326-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6326", "6326-NTN" ], "locale_variants": {} }, { "sku": "61828-NTN", "brand": "NTN", "manufacturer_designation": "6828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The open 61828-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61828-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61828-NTN drags the lip and overheats it.", "The open 61828 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3400 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828 on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61828-NTN bearing?", "a": "A 61828-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61828 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61828-NTN have?", "a": "Unless a clearance suffix says otherwise, 61828-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61828?", "a": "NTN lists the open 61828 under the bare designation 6828; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "What cage does NTN fit in 6828?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6828", "61828", "61828-NTN" ], "locale_variants": {} }, { "sku": "61828-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6828LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61828-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6828LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Contact seals add drag and heat: 61828-2RS-NTN runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61828-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 175 mm OD should be round within IT7; an oval bore pinches the outer ring of 61828-2RS-NTN and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6828LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828LLU on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "Order the C3 internal-clearance version (61828 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61828 is listed." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS-NTN bearing?", "a": "A 61828-2RS-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61828-2RS-NTN need?", "a": "61828-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61828 with a housing grease fitting instead." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61828?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6828LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×175×18 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6828LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61828-llu", "6828llu", "61828-2RS", "61828-2rs", "6828LLU", "61828-2RS-NTN" ], "locale_variants": {} }, { "sku": "61828-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6828ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6828ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Do not wash 61828-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61828-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828-ZZ-NTN.", "NTN catalogues the shielded version as 6828ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 61828 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3400 r/min for 61828; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61828 at 42.5 kN dynamic (C) and 44.5 kN static (C0), 2.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 850 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.", "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 42.5/44.5 kN load ratings, 2.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 850 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6828ZZ on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61828 is listed.", "Standard catalogue stock of 61828 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61828-ZZ-NTN bearing?", "a": "A 61828-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61828-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61828?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6828ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×175×18 mm ISO 15 envelope." }, { "q": "Is 6828ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61828-zz", "6828zz", "61828-ZZ", "6828ZZ", "61828-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61928-NTN", "brand": "NTN", "manufacturer_designation": "6928", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61928-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61928-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61928 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928 on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (61928 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61928-NTN bearing?", "a": "A 61928-NTN deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61928?", "a": "NTN lists the open 61928 under the bare designation 6928; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 6928 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6928", "61928", "61928-NTN" ], "locale_variants": {} }, { "sku": "61928-2RS", "brand": "NTN", "manufacturer_designation": "6928LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61928-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 190 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6928LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61928-2RS runs slower and cooler-limited than the open 61928; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61928-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61928-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61928-2RS drags the lip and overheats it.", "NTN catalogues the contact-sealed version as 6928LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928LLU on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61928 is listed." ], "faq": [ { "q": "What are the dimensions of a 61928-2RS bearing?", "a": "A 61928-2RS deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61928-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN suffix for a sealed 61928?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6928LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×190×24 mm ISO 15 envelope." }, { "q": "Is 6928LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-llu", "6928llu", "61928-2RS", "61928-2rs", "6928LLU" ], "locale_variants": {} }, { "sku": "61928-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6928ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 74, "static_load_kN": 71.5, "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 1620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6928ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61928-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61928-2RS for that.", "Shielded 61928-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61928-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 140 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61928-ZZ-NTN.", "NTN catalogues the shielded version as 6928ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 61928 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3200 r/min for 61928; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 74 kN dynamic load rating (C) and 71.5 kN static (C0), 3.7 kN fatigue load limit Cu, 61928 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 1620 g (1.6 kg), 61928 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 3200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928ZZ on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive.", "Standard catalogue stock of 61928 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61928 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61928-ZZ-NTN bearing?", "a": "A 61928-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61928-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61928-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61928?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6928ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×190×24 mm ISO 15 envelope." }, { "q": "Is 6928ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-zz", "6928zz", "61928-ZZ", "6928ZZ", "61928-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16028-NTN", "brand": "NTN", "manufacturer_designation": "16028", "series": "16000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 91, "static_load_kN": 85, "fatigue_load_limit_kN": 4.35, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16028 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 140 mm of 16028-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 210 mm OD of the 6028 at 140 mm bore but is only 22 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16028-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16028 units.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 16028-NTN and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16028 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 16028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 16028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 91 kN dynamic load rating (C) and 85 kN static (C0), 4.35 kN fatigue load limit Cu, 16028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2450 g (2.5 kg), 16028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×22 mm envelope of 16028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 91/85 kN load ratings, 4.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2450 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16028 on the 140×210×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16028 in a rated drive.", "Standard catalogue stock of 16028 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16028-NTN bearing?", "a": "A 16028-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 22 mm width (5.512 × 8.268 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 140 mm bore?", "a": "160 is the narrow extra-light section: 210×22 mm with a 35.0 mm radial section at 140 mm bore. It has the same bore and outside diameter as the 6028 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16028 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16028 uses the same ISO 15 envelope (140×210×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16028?", "a": "NTN lists the open 16028 under the bare designation 16028; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 16028 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16028", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16028", "16028-NTN" ], "locale_variants": {} }, { "sku": "6028-NTN", "brand": "NTN", "manufacturer_designation": "6028", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6028 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Storage matters for open bearings: 6028-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6028-NTN drags the lip and overheats it.", "The open 6028 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028 on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6028 is listed.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6028-NTN bearing?", "a": "A 6028-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6028-NTN have?", "a": "Unless a clearance suffix says otherwise, 6028-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6028 and verify the residual clearance after mounting." }, { "q": "How should 6028-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6028?", "a": "NTN lists the open 6028 under the bare designation 6028; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Does NTN offer 6028 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6028 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028", "6028-NTN" ], "locale_variants": {} }, { "sku": "6028-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6028LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6028LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6028-2RS-NTN runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6028-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6028-2RS-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6028LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028LLU on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "Standard catalogue stock of 6028 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS-NTN bearing?", "a": "A 6028-2RS-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the NTN suffix for a sealed 6028?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6028LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×210×33 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6028LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028-llu", "6028llu", "6028-2RS", "6028-2rs", "6028LLU", "6028-2RS-NTN" ], "locale_variants": {} }, { "sku": "6028-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6028ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 109, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6028ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Do not wash 6028-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6028-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6028-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6028ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 6028 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 6028; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 109 kN static (C0), 5.85 kN fatigue load limit Cu, 6028 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3350 g (3.4 kg), 6028 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 122/109 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3350 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6028ZZ on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive.", "Order the C3 internal-clearance version (6028 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ-NTN bearing?", "a": "A 6028-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6028-ZZ-NTN need?", "a": "6028-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6028?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6028ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×210×33 mm ISO 15 envelope." }, { "q": "Is 6028ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6028-zz", "6028zz", "6028-ZZ", "6028ZZ", "6028-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6228-NTN", "brand": "NTN", "manufacturer_designation": "6228", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6228 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 250 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "The open 6228-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6228 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2500 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228 on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6228 is listed." ], "faq": [ { "q": "What are the dimensions of a 6228-NTN bearing?", "a": "A 6228-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6228?", "a": "NTN lists the open 6228 under the bare designation 6228; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Does NTN offer 6228 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6228 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228", "6228-NTN" ], "locale_variants": {} }, { "sku": "6228-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6228LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6228LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6228 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6228-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6228-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the contact-sealed version as 6228LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228LLU on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6228 is listed." ], "faq": [ { "q": "What are the dimensions of a 6228-2RS-NTN bearing?", "a": "A 6228-2RS-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6228-2RS-NTN need?", "a": "6228-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6228 with a housing grease fitting instead." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6228?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6228LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×250×42 mm ISO 15 envelope." }, { "q": "Is 6228LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228-llu", "6228llu", "6228-2RS", "6228-2rs", "6228LLU", "6228-2RS-NTN" ], "locale_variants": {} }, { "sku": "6228-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6228ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 184, "static_load_kN": 150, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 7570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6228ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6228-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6228-2RS for that.", "Shielded 6228-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6228-ZZ-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6228ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 140 mm bore places 6228 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2500 r/min for 6228; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 184 kN dynamic load rating (C) and 150 kN static (C0), 8.4 kN fatigue load limit Cu, 6228 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7570 g (7.6 kg), 6228 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 184/150 kN load ratings, 8.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7570 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6228ZZ on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6228 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6228-ZZ-NTN bearing?", "a": "A 6228-ZZ-NTN deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6228-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6228-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6228 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6228?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6228ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 140×250×42 mm ISO 15 envelope." }, { "q": "Is 6228ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6228-zz", "6228zz", "6228-ZZ", "6228ZZ", "6228-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6328-NTN", "brand": "NTN", "manufacturer_designation": "6328", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 280, "static_load_kN": 246, "fatigue_load_limit_kN": 13, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 140 mm of 6328-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 140 mm bore gains dynamic rating through larger rolling elements on a 300 mm OD; the penalty is mass and a lower limiting speed than the 6228 — do not specify it for speed-critical shafts.", "The open 6328-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 300 mm OD should be round within IT7; an oval bore pinches the outer ring of 6328-NTN and shows up later as two-point loaded raceway wear.", "The open 6328 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 140 mm bore places 6328 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2200 r/min for 6328; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6328 at 280 kN dynamic (C) and 246 kN static (C0), 13 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18500 g (18.5 kg), 6328 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 140×300×62 mm envelope of 6328 gives a D/d ratio of 2.14 and 80.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 280/246 kN load ratings, 13 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6328 on the 140×300×62 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6328 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6328-NTN bearing?", "a": "A 6328-NTN deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6328-NTN have?", "a": "Unless a clearance suffix says otherwise, 6328-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6328 and verify the residual clearance after mounting." }, { "q": "How should 6328-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6328?", "a": "NTN lists the open 6328 under the bare designation 6328; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 140 mm bore envelope." }, { "q": "Is 6328 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6328-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6328-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6328", "6328-NTN" ], "locale_variants": {} }, { "sku": "61830-NTN", "brand": "NTN", "manufacturer_designation": "6830", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61830 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 150 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6230.", "The open 61830-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61830-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-NTN.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61830 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3100 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830 on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61830-NTN bearing?", "a": "A 61830-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61830 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61830 uses the same ISO 15 envelope (150×190×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61830-NTN have?", "a": "Unless a clearance suffix says otherwise, 61830-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61830 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61830?", "a": "NTN lists the open 61830 under the bare designation 6830; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 6830?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6830", "61830", "61830-NTN" ], "locale_variants": {} }, { "sku": "61830-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6830LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6830LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 150 mm of 61830-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "Heat is the enemy of the sealed 61830-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61830-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-2RS-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6830LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830LLU on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61830 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61830-2RS-NTN bearing?", "a": "A 61830-2RS-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61830-2RS-NTN need?", "a": "61830-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61830 with a housing grease fitting instead." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 61830?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6830LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×190×20 mm ISO 15 envelope." }, { "q": "Is 6830LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61830-llu", "6830llu", "61830-2RS", "61830-2rs", "6830LLU", "61830-2RS-NTN" ], "locale_variants": {} }, { "sku": "61830-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6830ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53, "static_load_kN": 55, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61830-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6830ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "ZZ shields are non-contact: 61830-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61830-2RS for that.", "Shielded 61830-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6830ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 61830 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3100 r/min for 61830; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61830 at 53 kN dynamic (C) and 55 kN static (C0), 2.8 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1160 g (1.2 kg), 61830 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53/55 kN load ratings, 2.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 3100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1160 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6830ZZ on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive.", "Standard catalogue stock of 61830 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61830 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61830-ZZ-NTN bearing?", "a": "A 61830-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61830-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61830-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61830 and verify the residual clearance after mounting." }, { "q": "How should 61830-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 61830?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6830ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×190×20 mm ISO 15 envelope." }, { "q": "Is 6830ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61830-zz", "6830zz", "61830-ZZ", "6830ZZ", "61830-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61930-NTN", "brand": "NTN", "manufacturer_designation": "6930", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61930 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 210 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61930-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61930 units.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 61930-NTN and shows up later as two-point loaded raceway wear.", "Never mix components between two 61930-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61930 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930 on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Order the C3 internal-clearance version (61930 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61930-NTN bearing?", "a": "A 61930-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61930-NTN have?", "a": "Unless a clearance suffix says otherwise, 61930-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61930 and verify the residual clearance after mounting." }, { "q": "How should 61930-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61930?", "a": "NTN lists the open 61930 under the bare designation 6930; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Does NTN offer 61930 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6930 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6930", "61930", "61930-NTN" ], "locale_variants": {} }, { "sku": "61930-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6930LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61930-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 210 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6930LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61930-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61930-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61930-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61930-2RS-NTN.", "NTN catalogues the contact-sealed version as 6930LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930LLU on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61930-2RS-NTN bearing?", "a": "A 61930-2RS-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61930 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61930 uses the same ISO 15 envelope (150×210×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61930-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61930-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61930 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61930?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6930LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×210×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6930LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61930-llu", "6930llu", "61930-2RS", "61930-2rs", "6930LLU", "61930-2RS-NTN" ], "locale_variants": {} }, { "sku": "61930-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6930ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 90.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 2470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6930ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61930-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61930-2RS for that.", "Do not wash 61930-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 61930-ZZ-NTN and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6930ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 61930 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 3000 r/min for 61930; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 90.5 kN static (C0), 4.55 kN fatigue load limit Cu, 61930 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2470 g (2.5 kg), 61930 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 94/90.5 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 3000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2470 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6930ZZ on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61930 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61930-ZZ-NTN bearing?", "a": "A 61930-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61930-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the NTN suffix for a sealed 61930?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6930ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×210×28 mm ISO 15 envelope." }, { "q": "Does NTN offer 61930 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6930ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61930-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61930-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61930-zz", "6930zz", "61930-ZZ", "6930ZZ", "61930-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16030-NTN", "brand": "NTN", "manufacturer_designation": "16030", "series": "16000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 107, "static_load_kN": 101, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 3070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 150 mm of 16030-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 225 mm OD of the 6030 at 150 mm bore but is only 24 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16030-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16030-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16030-NTN.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16030 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 16030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 16030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 107 kN dynamic load rating (C) and 101 kN static (C0), 5 kN fatigue load limit Cu, 16030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3070 g (3.1 kg), 16030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×24 mm envelope of 16030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 107/101 kN load ratings, 5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3070 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16030 on the 150×225×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16030 in a rated drive.", "Order the C3 internal-clearance version (16030 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 16030 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16030-NTN bearing?", "a": "A 16030-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 24 mm width (5.906 × 8.858 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16030-NTN have?", "a": "Unless a clearance suffix says otherwise, 16030-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16030 and verify the residual clearance after mounting." }, { "q": "How should 16030-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16030?", "a": "NTN lists the open 16030 under the bare designation 16030; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 16030?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16030", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16030", "16030-NTN" ], "locale_variants": {} }, { "sku": "6030-NTN", "brand": "NTN", "manufacturer_designation": "6030", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6030 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.", "Storage matters for open bearings: 6030-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Never mix components between two 6030-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6030-NTN and shows up later as two-point loaded raceway wear.", "The open 6030 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030 on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6030 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6030-NTN bearing?", "a": "A 6030-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6030 mean?", "a": "A bare 6030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6030?", "a": "NTN lists the open 6030 under the bare designation 6030; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "What cage does NTN fit in 6030?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030", "6030-NTN" ], "locale_variants": {} }, { "sku": "6030-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6030LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6030LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6030-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-2RS-NTN.", "NTN catalogues the contact-sealed version as 6030LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030LLU on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6030 is listed." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS-NTN bearing?", "a": "A 6030-2RS-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6030-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 6030-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting." }, { "q": "How should 6030-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6030?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6030LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×225×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6030 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6030LLU is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030-llu", "6030llu", "6030-2RS", "6030-2rs", "6030LLU", "6030-2RS-NTN" ], "locale_variants": {} }, { "sku": "6030-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6030ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 139, "static_load_kN": 126, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 4080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6030ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6030-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Shielded 6030-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-ZZ-NTN.", "NTN catalogues the shielded version as 6030ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 6030 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 6030; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 139 kN dynamic load rating (C) and 126 kN static (C0), 6.55 kN fatigue load limit Cu, 6030 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4080 g (4.1 kg), 6030 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 139/126 kN load ratings, 6.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4080 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6030ZZ on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ-NTN bearing?", "a": "A 6030-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6030 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6030?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6030ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×225×35 mm ISO 15 envelope." }, { "q": "Does NTN offer 6030 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6030ZZ is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6030-zz", "6030zz", "6030-ZZ", "6030ZZ", "6030-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6230-NTN", "brand": "NTN", "manufacturer_designation": "6230", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6230 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 270 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "The open 6230-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6230-NTN drags the lip and overheats it.", "The open 6230 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230 on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6230 is listed." ], "faq": [ { "q": "What are the dimensions of a 6230-NTN bearing?", "a": "A 6230-NTN deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6230 mean?", "a": "A bare 6230 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6230?", "a": "NTN lists the open 6230 under the bare designation 6230; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Is 6230 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230", "6230-NTN" ], "locale_variants": {} }, { "sku": "6230-2RS", "brand": "NTN", "manufacturer_designation": "6230LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6230LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 150 mm of 6230-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6230-2RS runs slower and cooler-limited than the open 6230; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6230-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "NTN catalogues the contact-sealed version as 6230LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1500 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230LLU on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6230-2RS bearing?", "a": "A 6230-2RS deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6230-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NTN suffix for a sealed 6230?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6230LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×270×45 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6230LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230-llu", "6230llu", "6230-2RS", "6230-2rs", "6230LLU" ], "locale_variants": {} }, { "sku": "6230-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6230ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 9410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6230-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 270 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6230ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 150 mm of 6230-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 150 mm bore the 62xx light series is the workhorse section; its 270×45 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6230-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6230-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "NTN catalogues the shielded version as 6230ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 150 mm bore places 6230 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6230; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 195 kN dynamic load rating (C) and 168 kN static (C0), 9.05 kN fatigue load limit Cu, 6230 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9410 g (9.4 kg), 6230 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230ZZ on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive.", "Standard catalogue stock of 6230 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6230 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6230-ZZ-NTN bearing?", "a": "A 6230-ZZ-NTN deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "Are 6230 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6230 uses the same ISO 15 envelope (150×270×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 6230?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6230ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 150×270×45 mm ISO 15 envelope." }, { "q": "Is 6230ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6230-zz", "6230zz", "6230-ZZ", "6230ZZ", "6230-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6330-NTN", "brand": "NTN", "manufacturer_designation": "6330", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 305, "static_load_kN": 284, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6330 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 150 mm of 6330-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 150 mm bore gains dynamic rating through larger rolling elements on a 320 mm OD; the penalty is mass and a lower limiting speed than the 6230 — do not specify it for speed-critical shafts.", "The open 6330-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 150×320×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6330-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6330 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 150 mm bore places 6330 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6330; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6330 at 305 kN dynamic (C) and 284 kN static (C0), 14.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 22000 g (22.0 kg), 6330 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 150×320×65 mm envelope of 6330 gives a D/d ratio of 2.13 and 85.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 305/284 kN load ratings, 14.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 22000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6330 on the 150×320×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6330 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (6330 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6330-NTN bearing?", "a": "A 6330-NTN deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6330-NTN have?", "a": "Unless a clearance suffix says otherwise, 6330-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6330 and verify the residual clearance after mounting." }, { "q": "How should 6330-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6330?", "a": "NTN lists the open 6330 under the bare designation 6330; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 150 mm bore envelope." }, { "q": "Does NTN offer 6330 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6330 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6330-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330", "equiv_brand": "SKF", "level": "full", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6330-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6330", "6330-NTN" ], "locale_variants": {} }, { "sku": "61832-NTN", "brand": "NTN", "manufacturer_designation": "6832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61832 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "The open 61832-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61832-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61832-NTN.", "The open 61832 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2900 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832 on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61832-NTN bearing?", "a": "A 61832-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61832-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832-NTN need?", "a": "The open 61832-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61832?", "a": "NTN lists the open 61832 under the bare designation 6832; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Is 6832 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6832", "61832", "61832-NTN" ], "locale_variants": {} }, { "sku": "61832-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6832LLU", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61832-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6832LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 160 mm of 61832-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "Contact seals add drag and heat: 61832-2RS-NTN runs slower and cooler-limited than the open 61832; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61832-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832-2RS-NTN.", "NTN catalogues the contact-sealed version as 6832LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832LLU on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61832 is listed.", "Standard catalogue stock of 61832 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61832-2RS-NTN bearing?", "a": "A 61832-2RS-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61832-2RS-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832-2RS-NTN need?", "a": "61832-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61832 with a housing grease fitting instead." }, { "q": "What is the NTN suffix for a sealed 61832?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6832LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×200×20 mm ISO 15 envelope." }, { "q": "Is 6832LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61832-llu", "6832llu", "61832-2RS", "61832-2rs", "6832LLU", "61832-2RS-NTN" ], "locale_variants": {} }, { "sku": "61832-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6832ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 53.5, "static_load_kN": 57, "fatigue_load_limit_kN": 2.82, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6832ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.", "ZZ shields are non-contact: 61832-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61832-2RS for that.", "Do not wash 61832-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61832-ZZ-NTN drags the lip and overheats it.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6832ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 61832 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2900 r/min for 61832; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61832 at 53.5 kN dynamic (C) and 57 kN static (C0), 2.82 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 53.5/57 kN load ratings, 2.82 kN fatigue load limit Cu NTN lists the grease limiting speed at 2900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6832ZZ on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61832 is listed.", "Order the C3 internal-clearance version (61832 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61832-ZZ-NTN bearing?", "a": "A 61832-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61832-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN suffix for a sealed 61832?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6832ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×200×20 mm ISO 15 envelope." }, { "q": "Is 6832ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61832-zz", "6832zz", "61832-ZZ", "6832ZZ", "61832-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61932-NTN", "brand": "NTN", "manufacturer_designation": "6932", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61932 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 160 mm bore the ring mass is significant: heat 61932 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61932-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61932-NTN-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-NTN.", "The open 61932 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932 on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61932-NTN bearing?", "a": "A 61932-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61932 mean?", "a": "A bare 61932 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61932?", "a": "NTN lists the open 61932 under the bare designation 6932; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "What cage does NTN fit in 6932?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6932", "61932", "61932-NTN" ], "locale_variants": {} }, { "sku": "61932-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6932LLU", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6932LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61932-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61932-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-2RS-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61932-2RS-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6932LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932LLU on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61932 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61932-2RS-NTN bearing?", "a": "A 61932-2RS-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61932 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61932 uses the same ISO 15 envelope (160×220×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61932-2RS-NTN have?", "a": "Unless a clearance suffix says otherwise, 61932-2RS-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61932 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61932?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6932LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×220×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6932LLU?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61932-llu", "6932llu", "61932-2RS", "61932-2rs", "6932LLU", "61932-2RS-NTN" ], "locale_variants": {} }, { "sku": "61932-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6932ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 96, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61932-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6932ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61932-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61932-2RS for that.", "Shielded 61932-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-ZZ-NTN.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932-ZZ-NTN.", "NTN catalogues the shielded version as 6932ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 61932 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2800 r/min for 61932; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 96 kN static (C0), 4.65 kN fatigue load limit Cu, 61932 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2610 g (2.6 kg), 61932 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/96 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2610 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6932ZZ on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive.", "Standard catalogue stock of 61932 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61932-ZZ-NTN bearing?", "a": "A 61932-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61932-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61932-ZZ-NTN need?", "a": "61932-ZZ-NTN is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the NTN suffix for a sealed 61932?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6932ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×220×28 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6932ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61932-zz", "6932zz", "61932-ZZ", "6932ZZ", "61932-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16032-NTN", "brand": "NTN", "manufacturer_designation": "16032", "series": "16000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 109, "static_load_kN": 108, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 160 mm bore shares the 240 mm outside diameter of the 6032 but is only 25 mm wide; a 6032 in a 25 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16032-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16032 units.", "Never mix components between two 16032-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16032 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 16032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 16032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 109 kN dynamic load rating (C) and 108 kN static (C0), 5.1 kN fatigue load limit Cu, 16032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3640 g (3.6 kg), 16032 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 160×240×25 mm envelope of 16032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 109/108 kN load ratings, 5.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3640 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16032 on the 160×240×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16032 in a rated drive.", "Standard catalogue stock of 16032 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16032-NTN bearing?", "a": "A 16032-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 25 mm width (6.299 × 9.449 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 16032-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 16032-NTN need?", "a": "The open 16032-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 16032?", "a": "NTN lists the open 16032 under the bare designation 16032; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 16032 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16032 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "16032", "equiv_brand": "FAG", "level": "full", "note": "Same 160×240×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16032", "16032-NTN" ], "locale_variants": {} }, { "sku": "6032-NTN", "brand": "NTN", "manufacturer_designation": "6032", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 160 mm of 6032-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "The open 6032-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6032-NTN.", "The open 6032 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032 on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "Standard catalogue stock of 6032 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6032-NTN bearing?", "a": "A 6032-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6032 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6032?", "a": "NTN lists the open 6032 under the bare designation 6032; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Is 6032 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032", "6032-NTN" ], "locale_variants": {} }, { "sku": "6032-2RS-NTN", "brand": "NTN", "manufacturer_designation": "6032LLU", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN's contact-seal catalogue number is 6032LLU (suffix LLU, or LLH low-torque variant), mapped here from the industry-neutral -2RS spelling; the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 160 mm of 6032-2RS-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6032-2RS-NTN runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6032-2RS-NTN in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 160 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 240 mm OD should be round within IT7; an oval bore pinches the outer ring of 6032-2RS-NTN and shows up later as two-point loaded raceway wear.", "NTN catalogues the contact-sealed version as 6032LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032LLU on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "Order the C3 internal-clearance version (6032 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS-NTN bearing?", "a": "A 6032-2RS-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6032-2RS-NTN need?", "a": "6032-2RS-NTN is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6032 with a housing grease fitting instead." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN suffix for a sealed 6032?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6032LLU), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×240×38 mm ISO 15 envelope." }, { "q": "Is 6032LLU a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032-llu", "6032llu", "6032-2RS", "6032-2rs", "6032LLU", "6032-2RS-NTN" ], "locale_variants": {} }, { "sku": "6032-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6032ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 158, "static_load_kN": 144, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 5050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6032-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6032ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 160 mm of 6032-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "ZZ shields are non-contact: 6032-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Do not wash 6032-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 6032-ZZ-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-ZZ-NTN-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6032ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 160 mm bore places 6032 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 6032; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 158 kN dynamic load rating (C) and 144 kN static (C0), 7.3 kN fatigue load limit Cu, 6032 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5050 g (5.0 kg), 6032 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 158/144 kN load ratings, 7.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5050 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6032ZZ on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6032 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ-NTN bearing?", "a": "A 6032-ZZ-NTN deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6032-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6032-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6032 and verify the residual clearance after mounting." }, { "q": "How should 6032-ZZ-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN suffix for a sealed 6032?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6032ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 160×240×38 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6032ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6032-zz", "6032zz", "6032-ZZ", "6032ZZ", "6032-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6232-NTN", "brand": "NTN", "manufacturer_designation": "6232", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 205, "static_load_kN": 186, "fatigue_load_limit_kN": 9.45, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 11700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 160 mm of 6232-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "The open 6232-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×290×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6232-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 290 mm OD should be round within IT7; an oval bore pinches the outer ring of 6232-NTN and shows up later as two-point loaded raceway wear.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6232 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6232 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6232; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 205 kN dynamic load rating (C) and 186 kN static (C0), 9.45 kN fatigue load limit Cu, 6232 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11700 g (11.7 kg), 6232 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 160×290×48 mm envelope of 6232 gives a D/d ratio of 1.81 and 65.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 205/186 kN load ratings, 9.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6232 on the 160×290×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6232 in a rated drive.", "Order the C3 internal-clearance version (6232 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6232-NTN bearing?", "a": "A 6232-NTN deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "Are 6232 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6232?", "a": "NTN lists the open 6232 under the bare designation 6232; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 6232 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6232 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6232-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232", "equiv_brand": "SKF", "level": "full", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6232-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6232", "6232-NTN" ], "locale_variants": {} }, { "sku": "6332-NTN", "brand": "NTN", "manufacturer_designation": "6332", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 310, "static_load_kN": 286, "fatigue_load_limit_kN": 14.2, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 160 mm of 6332-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 160 mm bore gains dynamic rating through larger rolling elements on a 340 mm OD; the penalty is mass and a lower limiting speed than the 6232 — do not specify it for speed-critical shafts.", "The open 6332-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 160×340×68 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6332-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 68 mm-wide ring of 6332-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6332 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 160 mm bore places 6332 at the lower end of NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6332; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6332 at 310 kN dynamic (C) and 286 kN static (C0), 14.2 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 26000 g (26.0 kg), 6332 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 160×340×68 mm envelope of 6332 gives a D/d ratio of 2.13 and 90.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 310/286 kN load ratings, 14.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 26000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6332 on the 160×340×68 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6332 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6332 is listed.", "Standard catalogue stock of 6332 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6332-NTN bearing?", "a": "A 6332-NTN deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6332-NTN have?", "a": "Unless a clearance suffix says otherwise, 6332-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6332 and verify the residual clearance after mounting." }, { "q": "How should 6332-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6332?", "a": "NTN lists the open 6332 under the bare designation 6332; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 160 mm bore envelope." }, { "q": "Does NTN offer 6332 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6332 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6332-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6332", "equiv_brand": "NSK", "level": "full", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6332-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6332", "6332-NTN" ], "locale_variants": {} }, { "sku": "61834-NTN", "brand": "NTN", "manufacturer_designation": "6834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 1630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61834 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 170 mm of 61834-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 61834-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61834 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 61834 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 61834; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61834 at 66.5 kN dynamic (C) and 70.5 kN static (C0), 3.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1630 g (1.6 kg), 61834 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 66.5/70.5 kN load ratings, 3.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6834 on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61834 is listed." ], "faq": [ { "q": "What are the dimensions of a 61834-NTN bearing?", "a": "A 61834-NTN deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61834 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61834-NTN have?", "a": "Unless a clearance suffix says otherwise, 61834-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61834?", "a": "NTN lists the open 61834 under the bare designation 6834; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 6834?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6834", "61834", "61834-NTN" ], "locale_variants": {} }, { "sku": "61834-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6834ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.5, "static_load_kN": 70.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2700, "max_rpm": 2700, "weight_g": 1630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61834-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NTN catalogue order number: 6834ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 170 mm of 61834-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "Do not wash 61834-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61834-ZZ-NTN units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6834ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 61834 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2700 r/min for 61834; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61834 at 66.5 kN dynamic (C) and 70.5 kN static (C0), 3.35 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 1630 g (1.6 kg), 61834 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 66.5/70.5 kN load ratings, 3.35 kN fatigue load limit Cu NTN lists the grease limiting speed at 2700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 1630 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6834ZZ on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (61834 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61834-ZZ-NTN bearing?", "a": "A 61834-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61834 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61834-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 61834-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 61834?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6834ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×215×22 mm ISO 15 envelope." }, { "q": "Is 6834ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61834-zz", "6834zz", "61834-ZZ", "6834ZZ", "61834-ZZ-NTN" ], "locale_variants": {} }, { "sku": "61934-NTN", "brand": "NTN", "manufacturer_designation": "6934", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 95, "static_load_kN": 95.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61934 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 230 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 61934 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61934-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×230×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61934-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 230 mm OD should be round within IT7; an oval bore pinches the outer ring of 61934-NTN and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61934 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 61934 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61934; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 95 kN dynamic load rating (C) and 95.5 kN static (C0), 4.5 kN fatigue load limit Cu, 61934 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2740 g (2.7 kg), 61934 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 95/95.5 kN load ratings, 4.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2740 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6934 on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive.", "Order the C3 internal-clearance version (61934 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61934 is listed." ], "faq": [ { "q": "What are the dimensions of a 61934-NTN bearing?", "a": "A 61934-NTN deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61934 mean?", "a": "A bare 61934 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61934?", "a": "NTN lists the open 61934 under the bare designation 6934; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 6934?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61934-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934", "equiv_brand": "NSK", "level": "full", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6934", "61934", "61934-NTN" ], "locale_variants": {} }, { "sku": "61934-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6934ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 95, "static_load_kN": 95.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6934ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61934-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61934-2RS for that.", "Do not wash 61934-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6934ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 61934 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61934; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 95 kN dynamic load rating (C) and 95.5 kN static (C0), 4.5 kN fatigue load limit Cu, 61934 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2740 g (2.7 kg), 61934 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 95/95.5 kN load ratings, 4.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2740 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6934ZZ on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61934 is listed." ], "faq": [ { "q": "What are the dimensions of a 61934-ZZ-NTN bearing?", "a": "A 61934-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61934 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61934 uses the same ISO 15 envelope (170×230×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the NTN suffix for a sealed 61934?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6934ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×230×28 mm ISO 15 envelope." }, { "q": "Is 6934ZZ a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61934-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61934-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61934-zz", "6934zz", "61934-ZZ", "6934ZZ", "61934-ZZ-NTN" ], "locale_variants": {} }, { "sku": "16034-NTN", "brand": "NTN", "manufacturer_designation": "16034", "series": "16000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 131, "static_load_kN": 128, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16034 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 34 by five gives the 170 mm bore; the 260 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 170 mm of 16034-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 160xx narrow section at 170 mm bore shares the 260 mm outside diameter of the 6034 but is only 28 mm wide; a 6034 in a 28 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16034-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16034-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 16034-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16034 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 16034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 16034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 131 kN dynamic load rating (C) and 128 kN static (C0), 5.9 kN fatigue load limit Cu, 16034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4930 g (4.9 kg), 16034 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 170×260×28 mm envelope of 16034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 131/128 kN load ratings, 5.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4930 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16034 on the 170×260×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16034 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16034 is listed.", "Order the C3 internal-clearance version (16034 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16034-NTN bearing?", "a": "A 16034-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 28 mm width (6.693 × 10.236 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16034 mean?", "a": "A bare 16034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 170 mm bore?", "a": "160 is the narrow extra-light section: 260×28 mm with a 45.0 mm radial section at 170 mm bore. It has the same bore and outside diameter as the 6034 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16034?", "a": "NTN lists the open 16034 under the bare designation 16034; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "What cage does NTN fit in 16034?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16034", "equiv_brand": "FAG", "level": "full", "note": "Same 170×260×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16034", "16034-NTN" ], "locale_variants": {} }, { "sku": "6034-NTN", "brand": "NTN", "manufacturer_designation": "6034", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 187, "static_load_kN": 172, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6034-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6034-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6034 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 187 kN dynamic load rating (C) and 172 kN static (C0), 8.55 kN fatigue load limit Cu, 6034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6034 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 187/172 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6034 on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6034 is listed." ], "faq": [ { "q": "What are the dimensions of a 6034-NTN bearing?", "a": "A 6034-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6034-NTN have?", "a": "Unless a clearance suffix says otherwise, 6034-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6034 and verify the residual clearance after mounting." }, { "q": "How should 6034-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6034?", "a": "NTN lists the open 6034 under the bare designation 6034; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6034 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6034 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6034", "6034-NTN" ], "locale_variants": {} }, { "sku": "6034-ZZ-NTN", "brand": "NTN", "manufacturer_designation": "6034ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 187, "static_load_kN": 172, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 6760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6034ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 6034-ZZ-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6034-ZZ-NTN blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6034-2RS for that.", "Do not wash 6034-ZZ-NTN in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6034ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying through an NTN channel.", "The 170 mm bore places 6034 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 6034; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 187 kN dynamic load rating (C) and 172 kN static (C0), 8.55 kN fatigue load limit Cu, 6034 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6760 g (6.8 kg), 6034 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 187/172 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6034ZZ on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive.", "Order the C3 internal-clearance version (6034 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6034-ZZ-NTN bearing?", "a": "A 6034-ZZ-NTN deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6034 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6034 uses the same ISO 15 envelope (170×260×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6034-ZZ-NTN have?", "a": "Unless a clearance suffix says otherwise, 6034-ZZ-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6034 and verify the residual clearance after mounting." }, { "q": "What is the NTN suffix for a sealed 6034?", "a": "NTN uses suffix LLU for the contact rubber seal (catalogue number 6034ZZ), LLB/LLF for non-contact rubber seals, LLH for the low-torque contact seal and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NTN suffixes while keeping the 170×260×42 mm ISO 15 envelope." }, { "q": "What cage does NTN fit in 6034ZZ?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "full", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6034-zz", "6034zz", "6034-ZZ", "6034ZZ", "6034-ZZ-NTN" ], "locale_variants": {} }, { "sku": "6234-NTN", "brand": "NTN", "manufacturer_designation": "6234", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 235, "static_load_kN": 223, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 170 mm bore the 62xx light series is the workhorse section; its 310×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6234-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6234 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 52 mm-wide ring of 6234-NTN drags the lip and overheats it.", "The open 6234 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6234 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 6234; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 235 kN dynamic load rating (C) and 223 kN static (C0), 11.1 kN fatigue load limit Cu, 6234 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 14500 g (14.5 kg), 6234 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 170×310×52 mm envelope of 6234 gives a D/d ratio of 1.82 and 70.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 235/223 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 14500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6234 on the 170×310×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6234 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 6234 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6234-NTN bearing?", "a": "A 6234-NTN deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6234 mean?", "a": "A bare 6234 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6234?", "a": "NTN lists the open 6234 under the bare designation 6234; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6234 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6234 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6234-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234", "equiv_brand": "SKF", "level": "full", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6234-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6234", "6234-NTN" ], "locale_variants": {} }, { "sku": "6334-NTN", "brand": "NTN", "manufacturer_designation": "6334", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 355, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 30700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6334 carries bore code 34 = 170 mm. Outside diameter 360 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 6334 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "Storage matters for open bearings: 6334-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6334-NTN-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 72 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6334 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 170 mm bore places 6334 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6334; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6334 at 360 kN dynamic (C) and 355 kN static (C0), 17 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 30700 g (30.7 kg), 6334 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 170×360×72 mm envelope of 6334 gives a D/d ratio of 2.12 and 95.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 360/355 kN load ratings, 17 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 30700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6334 on the 170×360×72 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6334 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6334-NTN bearing?", "a": "A 6334-NTN deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6334 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6334 uses the same ISO 15 envelope (170×360×72 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6334-NTN have?", "a": "Unless a clearance suffix says otherwise, 6334-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6334 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6334?", "a": "NTN lists the open 6334 under the bare designation 6334; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 170 mm bore envelope." }, { "q": "Does NTN offer 6334 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6334 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6334-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6334", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6334-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6334", "6334-NTN" ], "locale_variants": {} }, { "sku": "61836-NTN", "brand": "NTN", "manufacturer_designation": "6836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 67, "static_load_kN": 73, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 2030, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 61836 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "Storage matters for open bearings: 61836-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61836-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61836 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 61836 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2600 r/min for 61836; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61836 at 67 kN dynamic (C) and 73 kN static (C0), 3.4 kN fatigue load limit Cu; this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.", "At 2030 g (2.0 kg), 61836 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 180×225×22 mm envelope of 61836 gives a D/d ratio of 1.25 and only 22.5 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 67/73 kN load ratings, 3.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2030 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6836 on the 180×225×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61836 in a rated drive.", "Standard catalogue stock of 61836 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61836-NTN bearing?", "a": "A 61836-NTN deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61836-NTN need?", "a": "The open 61836-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61836?", "a": "NTN lists the open 61836 under the bare designation 6836; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6836 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61836-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61836", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6836", "61836", "61836-NTN" ], "locale_variants": {} }, { "sku": "61936-NTN", "brand": "NTN", "manufacturer_designation": "6936", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 122, "static_load_kN": 119, "fatigue_load_limit_kN": 5.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 180 mm of 61936-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 180 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61936-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61936-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61936 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 61936 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 61936; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 122 kN dynamic load rating (C) and 119 kN static (C0), 5.45 kN fatigue load limit Cu, 61936 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4760 g (4.8 kg), 61936 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 180×250×33 mm envelope of 61936 gives a D/d ratio of 1.39 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 122/119 kN load ratings, 5.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4760 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6936 on the 180×250×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61936 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 61936 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61936-NTN bearing?", "a": "A 61936-NTN deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61936 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61936 uses the same ISO 15 envelope (180×250×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61936?", "a": "NTN lists the open 61936 under the bare designation 6936; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6936 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61936-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61936-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6936", "61936", "61936-NTN" ], "locale_variants": {} }, { "sku": "16036-NTN", "brand": "NTN", "manufacturer_designation": "16036", "series": "16000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 129, "static_load_kN": 134, "fatigue_load_limit_kN": 5.85, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 6490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16036 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 36 by five gives the 180 mm bore; the 280 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 280 mm OD of the 6036 at 180 mm bore but is only 31 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16036-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16036-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16036 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 16036 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 16036; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 129 kN dynamic load rating (C) and 134 kN static (C0), 5.85 kN fatigue load limit Cu, 16036 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6490 g (6.5 kg), 16036 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×280×31 mm envelope of 16036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 129/134 kN load ratings, 5.85 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6490 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16036 on the 180×280×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16036 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 16036 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16036-NTN bearing?", "a": "A 16036-NTN deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 31 mm width (7.087 × 11.024 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16036-NTN have?", "a": "Unless a clearance suffix says otherwise, 16036-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16036 and verify the residual clearance after mounting." }, { "q": "How should 16036-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16036?", "a": "NTN lists the open 16036 under the bare designation 16036; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "What cage does NTN fit in 16036?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16036", "equiv_brand": "FAG", "level": "full", "note": "Same 180×280×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16036", "16036-NTN" ], "locale_variants": {} }, { "sku": "6036-NTN", "brand": "NTN", "manufacturer_designation": "6036", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 210, "static_load_kN": 199, "fatigue_load_limit_kN": 9.7, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 180 mm of 6036-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 180 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6236 before committing to the smaller envelope.", "Storage matters for open bearings: 6036-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 6036-NTN drags the lip and overheats it.", "Never mix components between two 6036-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6036 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6036 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 6036; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 210 kN dynamic load rating (C) and 199 kN static (C0), 9.7 kN fatigue load limit Cu, 6036 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8800 g (8.8 kg), 6036 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×280×46 mm envelope of 6036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 210/199 kN load ratings, 9.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6036 on the 180×280×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6036 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6036 is listed." ], "faq": [ { "q": "What are the dimensions of a 6036-NTN bearing?", "a": "A 6036-NTN deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6036-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6036-NTN need?", "a": "The open 6036-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6036?", "a": "NTN lists the open 6036 under the bare designation 6036; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Is 6036 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6036-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036", "equiv_brand": "SKF", "level": "full", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6036-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6036", "6036-NTN" ], "locale_variants": {} }, { "sku": "6236-NTN", "brand": "NTN", "manufacturer_designation": "6236", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 241, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 15100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 180 mm of 6236-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 180 mm bore the 62xx light series is the workhorse section; its 320×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6236-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6236 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 52 mm-wide ring of 6236-NTN drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6236-NTN-C3. No clearance suffix means normal CN clearance.", "The open 6236 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6236 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1900 r/min for 6236; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6236 at 252 kN dynamic (C) and 241 kN static (C0), 11.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15100 g (15.1 kg), 6236 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 180×320×52 mm envelope of 6236 gives a D/d ratio of 1.78 and 70.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 252/241 kN load ratings, 11.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6236 on the 180×320×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6236 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6236 is listed.", "Order the C3 internal-clearance version (6236 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6236-NTN bearing?", "a": "A 6236-NTN deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6236 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6236 uses the same ISO 15 envelope (180×320×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6236-NTN have?", "a": "Unless a clearance suffix says otherwise, 6236-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6236 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6236?", "a": "NTN lists the open 6236 under the bare designation 6236; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Does NTN offer 6236 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6236 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6236-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236", "equiv_brand": "SKF", "level": "full", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6236-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6236", "6236-NTN" ], "locale_variants": {} }, { "sku": "6336-NTN", "brand": "NTN", "manufacturer_designation": "6336", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 405, "fatigue_load_limit_kN": 19, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 35600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6336 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 380 mm outside diameter and 75 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6336 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6336 units.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6336 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 180 mm bore places 6336 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6336; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6336 at 390 kN dynamic (C) and 405 kN static (C0), 19 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 35600 g (35.6 kg), 6336 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 180×380×75 mm envelope of 6336 gives a D/d ratio of 2.11 and 100.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 390/405 kN load ratings, 19 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 35600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6336 on the 180×380×75 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6336 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6336-NTN bearing?", "a": "A 6336-NTN deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN order number for an open 6336?", "a": "NTN lists the open 6336 under the bare designation 6336; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 180 mm bore envelope." }, { "q": "Does NTN offer 6336 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6336 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6336-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6336", "equiv_brand": "SKF", "level": "full", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6336-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6336", "6336-NTN" ], "locale_variants": {} }, { "sku": "61838-NTN", "brand": "NTN", "manufacturer_designation": "6838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 81, "static_load_kN": 88, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61838 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 240 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61838-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61838-NTN drags the lip and overheats it.", "The open 61838 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 61838 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2400 r/min for 61838; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 81 kN dynamic load rating (C) and 88 kN static (C0), 4 kN fatigue load limit Cu, 61838 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2620 g (2.6 kg), 61838 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 190×240×24 mm envelope of 61838 gives a D/d ratio of 1.26 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 81/88 kN load ratings, 4 kN fatigue load limit Cu NTN lists the grease limiting speed at 2400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6838 on the 190×240×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61838 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61838 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61838-NTN bearing?", "a": "A 61838-NTN deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61838 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61838 uses the same ISO 15 envelope (190×240×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61838-NTN have?", "a": "Unless a clearance suffix says otherwise, 61838-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61838 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61838?", "a": "NTN lists the open 61838 under the bare designation 6838; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Is 6838 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61838-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61838", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6838", "61838", "61838-NTN" ], "locale_variants": {} }, { "sku": "61938-NTN", "brand": "NTN", "manufacturer_designation": "6938", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 127, "fatigue_load_limit_kN": 5.65, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 4980, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 190 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61938-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "The housing bore for the 260 mm OD should be round within IT7; an oval bore pinches the outer ring of 61938-NTN and shows up later as two-point loaded raceway wear.", "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61938 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 61938 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 61938; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 125 kN dynamic load rating (C) and 127 kN static (C0), 5.65 kN fatigue load limit Cu, 61938 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4980 g (5.0 kg), 61938 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 190×260×33 mm envelope of 61938 gives a D/d ratio of 1.37 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 125/127 kN load ratings, 5.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4980 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6938 on the 190×260×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61938 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61938 is listed.", "Standard catalogue stock of 61938 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61938-NTN bearing?", "a": "A 61938-NTN deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 190 mm bore?", "a": "619 is a thin section one step above 618: 260×33 mm with a 35.0 mm radial section at 190 mm bore; a 6238 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61938 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61938 uses the same ISO 15 envelope (190×260×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61938?", "a": "NTN lists the open 61938 under the bare designation 6938; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 61938 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6938 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61938-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938", "equiv_brand": "SKF", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61938-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6938", "61938", "61938-NTN" ], "locale_variants": {} }, { "sku": "16038-NTN", "brand": "NTN", "manufacturer_designation": "16038", "series": "16000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 149, "static_load_kN": 156, "fatigue_load_limit_kN": 6.7, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 6770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 190 mm of 16038-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 290 mm OD of the 6038 at 190 mm bore but is only 31 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16038-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16038-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16038-NTN.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16038 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 16038 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 16038; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 149 kN dynamic load rating (C) and 156 kN static (C0), 6.7 kN fatigue load limit Cu, 16038 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 6770 g (6.8 kg), 16038 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×290×31 mm envelope of 16038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 149/156 kN load ratings, 6.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 6770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16038 on the 190×290×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16038 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16038 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16038-NTN bearing?", "a": "A 16038-NTN deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 31 mm width (7.48 × 11.417 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 16038 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16038 uses the same ISO 15 envelope (190×290×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 16038-NTN have?", "a": "Unless a clearance suffix says otherwise, 16038-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16038 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 16038?", "a": "NTN lists the open 16038 under the bare designation 16038; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 16038 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16038 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "16038", "equiv_brand": "FAG", "level": "full", "note": "Same 190×290×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16038", "16038-NTN" ], "locale_variants": {} }, { "sku": "6038-NTN", "brand": "NTN", "manufacturer_designation": "6038", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 218, "static_load_kN": 215, "fatigue_load_limit_kN": 10.1, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 9180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6038 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 290 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6038 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6038-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6038-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 290 mm OD should be round within IT7; an oval bore pinches the outer ring of 6038-NTN and shows up later as two-point loaded raceway wear.", "The open 6038 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6038 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2100 r/min for 6038; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 218 kN dynamic load rating (C) and 215 kN static (C0), 10.1 kN fatigue load limit Cu, 6038 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 9180 g (9.2 kg), 6038 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×290×46 mm envelope of 6038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 218/215 kN load ratings, 10.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 9180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6038 on the 190×290×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6038 in a rated drive.", "Order the C3 internal-clearance version (6038 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6038-NTN bearing?", "a": "A 6038-NTN deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6038 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6038 uses the same ISO 15 envelope (190×290×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6038-NTN have?", "a": "Unless a clearance suffix says otherwise, 6038-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6038 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6038?", "a": "NTN lists the open 6038 under the bare designation 6038; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "What cage does NTN fit in 6038?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6038-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6038-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6038", "6038-NTN" ], "locale_variants": {} }, { "sku": "6238-NTN", "brand": "NTN", "manufacturer_designation": "6238", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 282, "static_load_kN": 281, "fatigue_load_limit_kN": 13.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 18200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6238 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 340 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6238 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "The open 6238-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×340×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6238-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 340 mm OD should be round within IT7; an oval bore pinches the outer ring of 6238-NTN and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6238-NTN.", "The open 6238 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6238 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1800 r/min for 6238; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6238 at 282 kN dynamic (C) and 281 kN static (C0), 13.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18200 g (18.2 kg), 6238 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 190×340×55 mm envelope of 6238 gives a D/d ratio of 1.79 and 75.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 282/281 kN load ratings, 13.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6238 on the 190×340×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6238 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6238 is listed.", "Standard catalogue stock of 6238 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6238-NTN bearing?", "a": "A 6238-NTN deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6238?", "a": "NTN lists the open 6238 under the bare designation 6238; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Does NTN offer 6238 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6238 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6238-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238", "equiv_brand": "SKF", "level": "full", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6238-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6238", "6238-NTN" ], "locale_variants": {} }, { "sku": "6338-NTN", "brand": "NTN", "manufacturer_designation": "6338", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 395, "static_load_kN": 415, "fatigue_load_limit_kN": 18.9, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 190 mm bore through a 400 mm OD and 78 mm width; the heavier rolling elements also trade away some speed versus a 6238.", "The open 6338-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6338-NTN.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 78 mm-wide ring of 6338-NTN drags the lip and overheats it.", "The open 6338 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 190 mm bore places 6338 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1600 r/min for 6338; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6338 at 395 kN dynamic (C) and 415 kN static (C0), 18.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 41000 g (41.0 kg), 6338 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 190×400×78 mm envelope of 6338 gives a D/d ratio of 2.11 and 105.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 395/415 kN load ratings, 18.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 41000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6338 on the 190×400×78 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6338 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6338 is listed." ], "faq": [ { "q": "What are the dimensions of a 6338-NTN bearing?", "a": "A 6338-NTN deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6338?", "a": "NTN lists the open 6338 under the bare designation 6338; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 190 mm bore envelope." }, { "q": "Is 6338 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6338-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6338", "equiv_brand": "SKF", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6338-M", "equiv_brand": "SKF", "level": "full", "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6338", "6338-NTN" ], "locale_variants": {} }, { "sku": "61840-NTN", "brand": "NTN", "manufacturer_designation": "6840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 82, "static_load_kN": 91.5, "fatigue_load_limit_kN": 4.05, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 2730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 200 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6240.", "The open 61840-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×250×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61840-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61840-NTN.", "The open 61840 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 61840 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2300 r/min for 61840; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 82 kN dynamic load rating (C) and 91.5 kN static (C0), 4.05 kN fatigue load limit Cu, 61840 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 2730 g (2.7 kg), 61840 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 200×250×24 mm envelope of 61840 gives a D/d ratio of 1.25 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 82/91.5 kN load ratings, 4.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 2300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 2730 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6840 on the 200×250×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61840 in a rated drive.", "Standard catalogue stock of 61840 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61840-NTN bearing?", "a": "A 61840-NTN deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61840-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61840-NTN need?", "a": "The open 61840-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61840?", "a": "NTN lists the open 61840 under the bare designation 6840; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Is 6840 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61840-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61840-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61840", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6840", "61840", "61840-NTN" ], "locale_variants": {} }, { "sku": "61940-NTN", "brand": "NTN", "manufacturer_designation": "6940", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 168, "fatigue_load_limit_kN": 7.45, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 200 mm bore the ring mass is significant: heat 61940 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61940-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.", "Never mix components between two 61940-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61940 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 61940 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2200 r/min for 61940; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 174 kN dynamic load rating (C) and 168 kN static (C0), 7.45 kN fatigue load limit Cu, 61940 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7100 g (7.1 kg), 61940 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×280×38 mm envelope of 61940 gives a D/d ratio of 1.40 and 40.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 174/168 kN load ratings, 7.45 kN fatigue load limit Cu NTN lists the grease limiting speed at 2200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6940 on the 200×280×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61940 in a rated drive.", "Standard catalogue stock of 61940 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61940 is listed." ], "faq": [ { "q": "What are the dimensions of a 61940-NTN bearing?", "a": "A 61940-NTN deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61940 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61940 uses the same ISO 15 envelope (200×280×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61940?", "a": "NTN lists the open 61940 under the bare designation 6940; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Does NTN offer 61940 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6940 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61940-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61940-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6940", "61940", "61940-NTN" ], "locale_variants": {} }, { "sku": "16040-NTN", "brand": "NTN", "manufacturer_designation": "16040", "series": "16000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 157, "static_load_kN": 160, "fatigue_load_limit_kN": 6.65, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16040 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 40 by five gives the 200 mm bore; the 310 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 200 mm bore the ring mass is significant: heat 16040 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Because the 160xx narrow section shares the 310 mm OD of the 6040 at 200 mm bore but is only 34 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16040-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16040-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 200 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16040-NTN.", "The open 16040 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 16040 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 16040; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 157 kN dynamic load rating (C) and 160 kN static (C0), 6.65 kN fatigue load limit Cu, 16040 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8680 g (8.7 kg), 16040 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×310×34 mm envelope of 16040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 157/160 kN load ratings, 6.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8680 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16040 on the 200×310×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16040 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16040 is listed.", "Order the C3 internal-clearance version (16040 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16040-NTN bearing?", "a": "A 16040-NTN deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 34 mm width (7.874 × 12.205 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16000 compare with other series at the same 200 mm bore?", "a": "160 is the narrow extra-light section: 310×34 mm with a 55.0 mm radial section at 200 mm bore. It has the same bore and outside diameter as the 6040 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "Are 16040 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16040 uses the same ISO 15 envelope (200×310×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 16040?", "a": "NTN lists the open 16040 under the bare designation 16040; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 16040?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16040", "equiv_brand": "FAG", "level": "partial", "note": "Same 200×310×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16040", "16040-NTN" ], "locale_variants": {} }, { "sku": "6040-NTN", "brand": "NTN", "manufacturer_designation": "6040", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 241, "static_load_kN": 243, "fatigue_load_limit_kN": 11.2, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 11900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 200 mm of 6040-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6040-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6040 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6040 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6040 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 2000 r/min for 6040; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 241 kN dynamic load rating (C) and 243 kN static (C0), 11.2 kN fatigue load limit Cu, 6040 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11900 g (11.9 kg), 6040 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 200×310×51 mm envelope of 6040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 241/243 kN load ratings, 11.2 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6040 on the 200×310×51 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6040 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6040-NTN bearing?", "a": "A 6040-NTN deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6040 mean?", "a": "A bare 6040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6040?", "a": "NTN lists the open 6040 under the bare designation 6040; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 6040?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6040-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6040", "equiv_brand": "NSK", "level": "full", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6040-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6040", "6040-NTN" ], "locale_variants": {} }, { "sku": "6240-NTN", "brand": "NTN", "manufacturer_designation": "6240", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 298, "static_load_kN": 310, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 21600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 200 mm of 6240-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 200 mm bore the 62xx light series is the workhorse section; its 360×58 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6240-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×360×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6240 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6240 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1700 r/min for 6240; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6240 at 298 kN dynamic (C) and 310 kN static (C0), 14.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 21600 g (21.6 kg), 6240 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 200×360×58 mm envelope of 6240 gives a D/d ratio of 1.80 and 80.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 298/310 kN load ratings, 14.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6240 on the 200×360×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6240 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6240 is listed." ], "faq": [ { "q": "What are the dimensions of a 6240-NTN bearing?", "a": "A 6240-NTN deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6240 mean?", "a": "A bare 6240 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the NTN order number for an open 6240?", "a": "NTN lists the open 6240 under the bare designation 6240; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "Does NTN offer 6240 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6240 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6240-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240", "equiv_brand": "SKF", "level": "full", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6240-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6240", "6240-NTN" ], "locale_variants": {} }, { "sku": "6340-NTN", "brand": "NTN", "manufacturer_designation": "6340", "series": "6300-series", "type": "deep_groove", "d_mm": 200, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 455, "static_load_kN": 500, "fatigue_load_limit_kN": 22.3, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 46300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6340 carries bore code 40 = 200 mm. Outside diameter 420 mm and width 80 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 200 mm of 6340-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 200 mm bore gains dynamic rating through larger rolling elements on a 420 mm OD; the penalty is mass and a lower limiting speed than the 6240 — do not specify it for speed-critical shafts.", "The open 6340-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 200×420×80 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6340 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6340-NTN.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6340 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200 mm bore places 6340 in NTN's large-size range; at these diameters the pressed-steel cage is speed-limited and NTN commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NTN distributor, and do not extrapolate small-bore speed ratings to this size.", "NTN lists the grease limiting speed at 1500 r/min for 6340; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 455 kN dynamic load rating (C) and 500 kN static (C0), 22.3 kN fatigue load limit Cu, 6340 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 46300 g (46.3 kg), 6340 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 200×420×80 mm envelope of 6340 gives a D/d ratio of 2.10 and 110.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 455/500 kN load ratings, 22.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 46300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6340 on the 200×420×80 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6340 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6340 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6340-NTN bearing?", "a": "A 6340-NTN deep-groove ball bearing has a 200 mm bore, 420 mm outer diameter and 80 mm width (7.874 × 16.535 × 3.15 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6340-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6340-NTN need?", "a": "The open 6340-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6340?", "a": "NTN lists the open 6340 under the bare designation 6340; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 200 mm bore envelope." }, { "q": "What cage does NTN fit in 6340?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6340", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×420×80 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6340", "6340-NTN" ], "locale_variants": {} }, { "sku": "61844-NTN", "brand": "NTN", "manufacturer_designation": "6844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 84.5, "static_load_kN": 98, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61844 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 270 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 220 mm of 61844-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "The open 61844-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.", "A 220 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 270 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61844-NTN.", "The open 61844 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 61844 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 2100 r/min for 61844; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 84.5 kN dynamic load rating (C) and 98 kN static (C0), 4.15 kN fatigue load limit Cu, 61844 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 3000 g (3.0 kg), 61844 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 220×270×24 mm envelope of 61844 gives a D/d ratio of 1.23 and only 25.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 84.5/98 kN load ratings, 4.15 kN fatigue load limit Cu NTN lists the grease limiting speed at 2100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 3000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6844 on the 220×270×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61844 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61844 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61844-NTN bearing?", "a": "A 61844-NTN deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61844-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61844-NTN need?", "a": "The open 61844-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61844?", "a": "NTN lists the open 61844 under the bare designation 6844; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 61844 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6844 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61844-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61844", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6844", "61844", "61844-NTN" ], "locale_variants": {} }, { "sku": "61944-NTN", "brand": "NTN", "manufacturer_designation": "6944", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 180, "fatigue_load_limit_kN": 7.55, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 7690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 220 mm of 61944-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61944-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61944 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 61944 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 2000 r/min for 61944; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 178 kN dynamic load rating (C) and 180 kN static (C0), 7.55 kN fatigue load limit Cu, 61944 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7690 g (7.7 kg), 61944 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×300×38 mm envelope of 61944 gives a D/d ratio of 1.36 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 178/180 kN load ratings, 7.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 2000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7690 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6944 on the 220×300×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61944 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61944 is listed.", "Order the C3 internal-clearance version (61944 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61944-NTN bearing?", "a": "A 61944-NTN deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61944-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61944-NTN need?", "a": "The open 61944-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61944?", "a": "NTN lists the open 61944 under the bare designation 6944; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 61944 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6944 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61944-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61944-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6944", "61944", "61944-NTN" ], "locale_variants": {} }, { "sku": "16044", "brand": "NTN", "manufacturer_designation": "16044", "series": "16000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 200, "static_load_kN": 216, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 11300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 340 mm OD of the 6044 at 220 mm bore but is only 37 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "Storage matters for open bearings: 16044 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16044 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16044-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 16044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 16044 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 16044; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 200 kN dynamic load rating (C) and 216 kN static (C0), 8.65 kN fatigue load limit Cu, 16044 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11300 g (11.3 kg), 16044 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×340×37 mm envelope of 16044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 200/216 kN load ratings, 8.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16044 on the 220×340×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16044 in a rated drive.", "Standard catalogue stock of 16044 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16044 bearing?", "a": "A 16044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 37 mm width (8.661 × 13.386 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16044 bore code work?", "a": "The last two digits of 16044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16044 mean?", "a": "A bare 16044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16044?", "a": "NTN lists the open 16044 under the bare designation 16044; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 16044 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 16044 is the correct choice." } ], "cross_ref": [], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16044" ], "locale_variants": {} }, { "sku": "6044-NTN", "brand": "NTN", "manufacturer_designation": "6044", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 267, "static_load_kN": 289, "fatigue_load_limit_kN": 12.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 15700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 6044 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6044-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 56 mm-wide ring of 6044-NTN drags the lip and overheats it.", "The open 6044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6044 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 6044; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6044 at 267 kN dynamic (C) and 289 kN static (C0), 12.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 15700 g (15.7 kg), 6044 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 220×340×56 mm envelope of 6044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 267/289 kN load ratings, 12.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 15700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6044 on the 220×340×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6044 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6044-NTN bearing?", "a": "A 6044-NTN deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6044 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6044 uses the same ISO 15 envelope (220×340×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 6044?", "a": "NTN lists the open 6044 under the bare designation 6044; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "What cage does NTN fit in 6044?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6044-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6044-M", "equiv_brand": "SKF", "level": "full", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6044", "6044-NTN" ], "locale_variants": {} }, { "sku": "6244-NTN", "brand": "NTN", "manufacturer_designation": "6244", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 330, "static_load_kN": 365, "fatigue_load_limit_kN": 15.8, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 30200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6244 carries bore code 44 = 220 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 220 mm of 6244-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 220 mm bore the 62xx light series is the workhorse section; its 400×65 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6244-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6244-NTN-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6244-NTN drags the lip and overheats it.", "The open 6244 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6244 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 6244; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6244 at 330 kN dynamic (C) and 365 kN static (C0), 15.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 30200 g (30.2 kg), 6244 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 220×400×65 mm envelope of 6244 gives a D/d ratio of 1.82 and 90.0 mm radial section height — a standard medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to the listed limiting speed, and C3 clearance is the common choice for hot shafts.", "The 330/365 kN load ratings, 15.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 30200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6244 on the 220×400×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6244 in a rated drive.", "Standard catalogue stock of 6244 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6244 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6244-NTN bearing?", "a": "A 6244-NTN deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6244-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6244-NTN need?", "a": "The open 6244-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6244?", "a": "NTN lists the open 6244 under the bare designation 6244; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Does NTN offer 6244 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6244 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6244-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6244", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6244-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6244", "6244-NTN" ], "locale_variants": {} }, { "sku": "6344-NTN", "brand": "NTN", "manufacturer_designation": "6344", "series": "6300-series", "type": "deep_groove", "d_mm": 220, "D_mm": 460, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 455, "static_load_kN": 520, "fatigue_load_limit_kN": 22, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 60800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6344 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 460 mm outside diameter and 88 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 220 mm bore through a 460 mm OD and 88 mm width; the heavier rolling elements also trade away some speed versus a 6244.", "The open 6344-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 220×460×88 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6344-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 460 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6344-NTN.", "The open 6344 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 220 mm bore places 6344 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1400 r/min for 6344; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 455 kN dynamic load rating (C) and 520 kN static (C0), 22 kN fatigue load limit Cu, 6344 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 60800 g (60.8 kg), 6344 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 220×460×88 mm envelope of 6344 gives a D/d ratio of 2.09 and 120.0 mm radial section height — a heavy section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 455/520 kN load ratings, 22 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 60800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6344 on the 220×460×88 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6344 in a rated drive.", "Standard catalogue stock of 6344 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (6344 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6344-NTN bearing?", "a": "A 6344-NTN deep-groove ball bearing has a 220 mm bore, 460 mm outer diameter and 88 mm width (8.661 × 18.11 × 3.465 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6344 bore code work?", "a": "The last two digits of 6344 are bore code 44, giving 44 × 5 = 220 mm bore. The 460 mm outside diameter and 88 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6344 mean?", "a": "A bare 6344 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 6344?", "a": "NTN lists the open 6344 under the bare designation 6344; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 220 mm bore envelope." }, { "q": "Is 6344 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6344", "equiv_brand": "NSK", "level": "full", "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6344-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6344", "6344-NTN" ], "locale_variants": {} }, { "sku": "61848-NTN", "brand": "NTN", "manufacturer_designation": "6848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 94, "static_load_kN": 112, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61848-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-NTN-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61848 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 61848 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1900 r/min for 61848; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 94 kN dynamic load rating (C) and 112 kN static (C0), 4.55 kN fatigue load limit Cu, 61848 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 4600 g (4.6 kg), 61848 needs mechanical handling for mounting; NTN recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.", "The 240×300×28 mm envelope of 61848 gives a D/d ratio of 1.25 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 94/112 kN load ratings, 4.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 4600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6848 on the 240×300×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61848 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61848-NTN bearing?", "a": "A 61848-NTN deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61848-NTN need?", "a": "The open 61848-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61848 bore code work?", "a": "The last two digits of 61848 are bore code 48, giving 48 × 5 = 240 mm bore. The 300 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61848?", "a": "NTN lists the open 61848 under the bare designation 6848; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6848 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61848-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61848-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61848", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6848", "61848", "61848-NTN" ], "locale_variants": {} }, { "sku": "61948-NTN", "brand": "NTN", "manufacturer_designation": "6948", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 188, "static_load_kN": 203, "fatigue_load_limit_kN": 8.05, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 8280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61948-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61948-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 320 mm OD should be round within IT7; an oval bore pinches the outer ring of 61948-NTN and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61948-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61948 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 61948 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1800 r/min for 61948; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 188 kN dynamic load rating (C) and 203 kN static (C0), 8.05 kN fatigue load limit Cu, 61948 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 8280 g (8.3 kg), 61948 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×320×38 mm envelope of 61948 gives a D/d ratio of 1.33 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 188/203 kN load ratings, 8.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1800 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 8280 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6948 on the 240×320×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61948 in a rated drive.", "Order the C3 internal-clearance version (61948 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61948 is listed." ], "faq": [ { "q": "What are the dimensions of a 61948-NTN bearing?", "a": "A 61948-NTN deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61948-NTN need?", "a": "The open 61948-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61948?", "a": "NTN lists the open 61948 under the bare designation 6948; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6948 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61948-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61948-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6948", "61948", "61948-NTN" ], "locale_variants": {} }, { "sku": "16048", "brand": "NTN", "manufacturer_designation": "16048", "series": "16000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 197, "static_load_kN": 217, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16048 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 48 by five gives the 240 mm bore; the 360 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 240 mm of 16048 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Because the 160xx narrow section shares the 360 mm OD of the 6048 at 240 mm bore but is only 37 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "Storage matters for open bearings: 16048 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16048 units.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 360 mm OD should be round within IT7; an oval bore pinches the outer ring of 16048 and shows up later as two-point loaded raceway wear.", "The open 16048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 16048 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 16048; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 197 kN dynamic load rating (C) and 217 kN static (C0), 8.3 kN fatigue load limit Cu, 16048 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12100 g (12.1 kg), 16048 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×360×37 mm envelope of 16048 gives a D/d ratio of 1.50 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 197/217 kN load ratings, 8.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16048 on the 240×360×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16048 in a rated drive.", "Standard catalogue stock of 16048 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16048 bearing?", "a": "A 16048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 37 mm width (9.449 × 14.173 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16048 have?", "a": "Unless a clearance suffix says otherwise, 16048 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16048 and verify the residual clearance after mounting." }, { "q": "How should 16048 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16048?", "a": "NTN lists the open 16048 under the bare designation 16048; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "What cage does NTN fit in 16048?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16048-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×360×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16048" ], "locale_variants": {} }, { "sku": "6048-NTN", "brand": "NTN", "manufacturer_designation": "6048", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 310, "fatigue_load_limit_kN": 12.8, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 16800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6048 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 360 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6048-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6048-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 240 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6048-NTN.", "Never mix components between two 6048-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 240 mm bore places 6048 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 6048; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6048 at 276 kN dynamic (C) and 310 kN static (C0), 12.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 16800 g (16.8 kg), 6048 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 240×360×56 mm envelope of 6048 gives a D/d ratio of 1.50 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 276/310 kN load ratings, 12.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 16800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6048 on the 240×360×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6048 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6048 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6048-NTN bearing?", "a": "A 6048-NTN deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6048 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6048 uses the same ISO 15 envelope (240×360×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6048-NTN have?", "a": "Unless a clearance suffix says otherwise, 6048-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6048 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6048?", "a": "NTN lists the open 6048 under the bare designation 6048; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 240 mm bore envelope." }, { "q": "Is 6048 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6048-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6048", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6048-M", "equiv_brand": "SKF", "level": "full", "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6048", "6048-NTN" ], "locale_variants": {} }, { "sku": "61852-NTN", "brand": "NTN", "manufacturer_designation": "6852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 96.5, "static_load_kN": 120, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 5000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61852 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 260 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6252.", "Storage matters for open bearings: 61852-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61852 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 61852 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1700 r/min for 61852; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 96.5 kN dynamic load rating (C) and 120 kN static (C0), 4.65 kN fatigue load limit Cu, 61852 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 5000 g (5.0 kg), 61852 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×320×28 mm envelope of 61852 gives a D/d ratio of 1.23 and only 30.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 96.5/120 kN load ratings, 4.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1700 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 5000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6852 on the 260×320×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61852 in a rated drive.", "Order the C3 internal-clearance version (61852 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61852 is listed." ], "faq": [ { "q": "What are the dimensions of a 61852-NTN bearing?", "a": "A 61852-NTN deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61852-NTN have?", "a": "Unless a clearance suffix says otherwise, 61852-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61852 and verify the residual clearance after mounting." }, { "q": "How should 61852-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 260 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61852?", "a": "NTN lists the open 61852 under the bare designation 6852; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "Is 6852 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61852-FAG", "equiv_brand": "FAG", "level": "full", "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61852", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6852", "61852", "61852-NTN" ], "locale_variants": {} }, { "sku": "61952-NTN", "brand": "NTN", "manufacturer_designation": "6952", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 245, "static_load_kN": 280, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 13900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61952 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (50.0 mm section height at 260 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61952-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "A 260 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 61952-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61952 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 61952 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1600 r/min for 61952; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 245 kN dynamic load rating (C) and 280 kN static (C0), 10.9 kN fatigue load limit Cu, 61952 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 13900 g (13.9 kg), 61952 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×360×46 mm envelope of 61952 gives a D/d ratio of 1.38 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 245/280 kN load ratings, 10.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 13900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6952 on the 260×360×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61952 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 61952-NTN bearing?", "a": "A 61952-NTN deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61952-NTN need?", "a": "The open 61952-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61952?", "a": "NTN lists the open 61952 under the bare designation 6952; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "What cage does NTN fit in 6952?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61952", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61952-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6952", "61952", "61952-NTN" ], "locale_variants": {} }, { "sku": "16052", "brand": "NTN", "manufacturer_designation": "16052", "series": "16000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 16052 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 260 mm bore shares the 400 mm outside diameter of the 6052 but is only 44 mm wide; a 6052 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16052 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 260 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 16052 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 16052; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 16052 at 252 kN dynamic (C) and 299 kN static (C0), 11.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 18500 g (18.5 kg), 16052 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 260×400×44 mm envelope of 16052 gives a D/d ratio of 1.54 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16052 on the 260×400×44 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16052 in a rated drive.", "Standard catalogue stock of 16052 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16052 bearing?", "a": "A 16052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 44 mm width (10.236 × 15.748 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 16052 mean?", "a": "A bare 16052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 260 mm bore?", "a": "160 is the narrow extra-light section: 400×44 mm with a 70.0 mm radial section at 260 mm bore. It has the same bore and outside diameter as the 6052 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN order number for an open 16052?", "a": "NTN lists the open 16052 under the bare designation 16052; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "What cage does NTN fit in 16052?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16052-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 260×400×44 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16052" ], "locale_variants": {} }, { "sku": "6052-NTN", "brand": "NTN", "manufacturer_designation": "6052", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 375, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 260 mm of 6052-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 260 mm bore uses a smaller 400 mm OD than a 6252; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6052-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6052 units.", "Measure the shaft, do not trust the drawing: a 260 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6052-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 260 mm bore places 6052 in NTN's upper large-size range; centrifugal force at this diameter sharply caps the grease limiting speed, so NTN usually supplies a machined brass cage (suffix M) and expects oil lubrication for continuous duty. Confirm relubrication interval and cage material with the NTN distributor.", "NTN lists the grease limiting speed at 1500 r/min for 6052; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 6052 at 325 kN dynamic (C) and 375 kN static (C0), 15.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 25000 g (25.0 kg), 6052 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 260×400×65 mm envelope of 6052 gives a D/d ratio of 1.54 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 325/375 kN load ratings, 15.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 25000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6052 on the 260×400×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6052 in a rated drive.", "Order the C3 internal-clearance version (6052 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "Standard catalogue stock of 6052 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6052-NTN bearing?", "a": "A 6052-NTN deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6052 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6052 uses the same ISO 15 envelope (260×400×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6052-NTN have?", "a": "Unless a clearance suffix says otherwise, 6052-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6052 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 6052?", "a": "NTN lists the open 6052 under the bare designation 6052; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 260 mm bore envelope." }, { "q": "Is 6052 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6052", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6052-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6052", "6052-NTN" ], "locale_variants": {} }, { "sku": "61856-NTN", "brand": "NTN", "manufacturer_designation": "6856", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 177, "fatigue_load_limit_kN": 6.65, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 7400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61856 carries bore code 56 = 280 mm. Outside diameter 350 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 280 mm bore has only a 35.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6256.", "The open 61856-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 280×350×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61856-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 280 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61856-NTN.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 350 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61856-NTN.", "The open 61856 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 61856 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1600 r/min for 61856; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 151 kN dynamic load rating (C) and 177 kN static (C0), 6.65 kN fatigue load limit Cu, 61856 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 7400 g (7.4 kg), 61856 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 280×350×33 mm envelope of 61856 gives a D/d ratio of 1.25 and only 35.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 151/177 kN load ratings, 6.65 kN fatigue load limit Cu NTN lists the grease limiting speed at 1600 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 7400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6856 on the 280×350×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61856 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61856 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61856-NTN bearing?", "a": "A 61856-NTN deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61856 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61856 uses the same ISO 15 envelope (280×350×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61856-NTN have?", "a": "Unless a clearance suffix says otherwise, 61856-NTN is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61856 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61856?", "a": "NTN lists the open 61856 under the bare designation 6856; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Does NTN offer 61856 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6856 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61856", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61856-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6856", "61856", "61856-NTN" ], "locale_variants": {} }, { "sku": "61956-NTN", "brand": "NTN", "manufacturer_designation": "6956", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 14800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61956 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 380 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 61956 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 280 mm bore (50.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61956-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 280 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61956 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 61956 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1500 r/min for 61956; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61956 at 252 kN dynamic (C) and 299 kN static (C0), 11.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 14800 g (14.8 kg), 61956 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 280×380×46 mm envelope of 61956 gives a D/d ratio of 1.36 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 14800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6956 on the 280×380×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61956 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61956 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61956-NTN bearing?", "a": "A 61956-NTN deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61956-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61956-NTN need?", "a": "The open 61956-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61956?", "a": "NTN lists the open 61956 under the bare designation 6956; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 6956 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61956", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61956-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6956", "61956", "61956-NTN" ], "locale_variants": {} }, { "sku": "16056", "brand": "NTN", "manufacturer_designation": "16056", "series": "16000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 257, "static_load_kN": 315, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 16056 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 280 mm bore shares the 420 mm outside diameter of the 6056 but is only 44 mm wide; a 6056 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16056 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 44 mm-wide ring of 16056 drags the lip and overheats it.", "The housing bore for the 420 mm OD should be round within IT7; an oval bore pinches the outer ring of 16056 and shows up later as two-point loaded raceway wear.", "The open 16056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 16056 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 16056; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16056 at 257 kN dynamic (C) and 315 kN static (C0), 11.3 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 23000 g (23.0 kg), 16056 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 280×420×44 mm envelope of 16056 gives a D/d ratio of 1.50 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 257/315 kN load ratings, 11.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 23000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16056 on the 280×420×44 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16056 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Standard catalogue stock of 16056 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 16056 bearing?", "a": "A 16056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 44 mm width (11.024 × 16.535 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16056 bore code work?", "a": "The last two digits of 16056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16056 mean?", "a": "A bare 16056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16056?", "a": "NTN lists the open 16056 under the bare designation 16056; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 16056 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16056-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 280×420×44 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16056" ], "locale_variants": {} }, { "sku": "6056-NTN", "brand": "NTN", "manufacturer_designation": "6056", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 420, "fatigue_load_limit_kN": 16.9, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 280 mm bore uses a smaller 420 mm OD than a 6256; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6056-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6056-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6056-NTN drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 280 mm bore places 6056 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 6056; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 6056 at 360 kN dynamic (C) and 420 kN static (C0), 16.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 31000 g (31.0 kg), 6056 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 280×420×65 mm envelope of 6056 gives a D/d ratio of 1.50 and 70.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 360/420 kN load ratings, 16.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 31000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6056 on the 280×420×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6056 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 6056 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 6056-NTN bearing?", "a": "A 6056-NTN deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6056-NTN need?", "a": "The open 6056-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6056?", "a": "NTN lists the open 6056 under the bare designation 6056; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 280 mm bore envelope." }, { "q": "Is 6056 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6056", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6056-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6056", "6056-NTN" ], "locale_variants": {} }, { "sku": "61860-NTN", "brand": "NTN", "manufacturer_designation": "6860", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 179, "static_load_kN": 210, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61860 carries bore code 60 = 300 mm. Outside diameter 380 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 300 mm of 61860-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 300 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6260.", "Storage matters for open bearings: 61860-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61860 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 380 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61860-NTN.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61860-NTN-C3. No clearance suffix means normal CN clearance.", "The open 61860 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 61860 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1500 r/min for 61860; this is a large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 179 kN dynamic load rating (C) and 210 kN static (C0), 7.6 kN fatigue load limit Cu, 61860 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 10500 g (10.5 kg), 61860 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 300×380×38 mm envelope of 61860 gives a D/d ratio of 1.27 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 179/210 kN load ratings, 7.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1500 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 10500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6860 on the 300×380×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61860 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Standard catalogue stock of 61860 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61860-NTN bearing?", "a": "A 61860-NTN deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61860-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61860-NTN need?", "a": "The open 61860-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61860?", "a": "NTN lists the open 61860 under the bare designation 6860; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Does NTN offer 61860 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6860 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61860", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61860-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6860", "61860", "61860-NTN" ], "locale_variants": {} }, { "sku": "61960-NTN", "brand": "NTN", "manufacturer_designation": "6960", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 305, "static_load_kN": 375, "fatigue_load_limit_kN": 13.7, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61960 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 420 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 300 mm of 61960-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 300 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61960-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 56 mm-wide ring of 61960-NTN drags the lip and overheats it.", "Never mix components between two 61960-NTN units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61960 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 61960 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 61960; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61960 at 305 kN dynamic (C) and 375 kN static (C0), 13.7 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 23500 g (23.5 kg), 61960 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×420×56 mm envelope of 61960 gives a D/d ratio of 1.40 and 60.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 305/375 kN load ratings, 13.7 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 23500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6960 on the 300×420×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61960 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61960-NTN bearing?", "a": "A 61960-NTN deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61960-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61960-NTN need?", "a": "The open 61960-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61960?", "a": "NTN lists the open 61960 under the bare designation 6960; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Is 6960 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61960", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61960-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6960", "61960", "61960-NTN" ], "locale_variants": {} }, { "sku": "16060", "brand": "NTN", "manufacturer_designation": "16060", "series": "16000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 410, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 32500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Because the 160xx narrow section shares the 460 mm OD of the 6060 at 300 mm bore but is only 50 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16060 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 300 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16060.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16060-C3. No clearance suffix means normal CN clearance.", "The open 16060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 16060 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 16060; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16060 at 325 kN dynamic (C) and 410 kN static (C0), 14.5 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 32500 g (32.5 kg), 16060 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×460×50 mm envelope of 16060 gives a D/d ratio of 1.53 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 325/410 kN load ratings, 14.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 32500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16060 on the 300×460×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16060 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 16060 bearing?", "a": "A 16060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 50 mm width (11.811 × 18.11 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16060 need?", "a": "The open 16060 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16060 bore code work?", "a": "The last two digits of 16060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 16060?", "a": "NTN lists the open 16060 under the bare designation 16060; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "What cage does NTN fit in 16060?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16060-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×460×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16060" ], "locale_variants": {} }, { "sku": "6060", "brand": "NTN", "manufacturer_designation": "6060", "series": "6000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 395, "static_load_kN": 480, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 43800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6060 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 460 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 300 mm bore uses a smaller 460 mm OD than a 6260; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6060 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6060 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 74 mm-wide ring of 6060 drags the lip and overheats it.", "The open 6060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 300 mm bore places 6060 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 6060; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 6060 at 395 kN dynamic (C) and 480 kN static (C0), 18.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 43800 g (43.8 kg), 6060 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 300×460×74 mm envelope of 6060 gives a D/d ratio of 1.53 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 395/480 kN load ratings, 18.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 43800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6060 on the 300×460×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6060 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6060 is listed.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6060 bearing?", "a": "A 6060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 74 mm width (11.811 × 18.11 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6060 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6060 need?", "a": "The open 6060 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 6060?", "a": "NTN lists the open 6060 under the bare designation 6060; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 300 mm bore envelope." }, { "q": "Does NTN offer 6060 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6060 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6060-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×460×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6060" ], "locale_variants": {} }, { "sku": "61864-NTN", "brand": "NTN", "manufacturer_designation": "6864", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 228, "fatigue_load_limit_kN": 7.95, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 10900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 320 mm of 61864-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61864-NTN leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864-NTN.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61864 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 61864 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1400 r/min for 61864; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 186 kN dynamic load rating (C) and 228 kN static (C0), 7.95 kN fatigue load limit Cu, 61864 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 10900 g (10.9 kg), 61864 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 320×400×38 mm envelope of 61864 gives a D/d ratio of 1.25 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 186/228 kN load ratings, 7.95 kN fatigue load limit Cu NTN lists the grease limiting speed at 1400 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 10900 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6864 on the 320×400×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61864 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61864 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61864-NTN bearing?", "a": "A 61864-NTN deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61864 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61864 uses the same ISO 15 envelope (320×400×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61864?", "a": "NTN lists the open 61864 under the bare designation 6864; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Is 6864 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61864", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61864-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6864", "61864", "61864-NTN" ], "locale_variants": {} }, { "sku": "61964", "brand": "NTN", "manufacturer_designation": "6964", "series": "61900-series", "type": "deep_groove", "d_mm": 320, "D_mm": 440, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 315, "static_load_kN": 405, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 24800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61964 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 64 by five gives the 320 mm bore; the 440 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 320 mm bore the ring mass is significant: heat 61964 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 320 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61964 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×440×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61964 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 440 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61964.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61964 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 61964 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1300 r/min for 61964; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61964 at 315 kN dynamic (C) and 405 kN static (C0), 14.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 24800 g (24.8 kg), 61964 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×440×56 mm envelope of 61964 gives a D/d ratio of 1.38 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 315/405 kN load ratings, 14.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 24800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6964 on the 320×440×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61964 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (61964 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61964 bearing?", "a": "A 61964 deep-groove ball bearing has a 320 mm bore, 440 mm outer diameter and 56 mm width (12.598 × 17.323 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61964 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 320 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61964 need?", "a": "The open 61964 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61964?", "a": "NTN lists the open 61964 under the bare designation 6964; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "What cage does NTN fit in 6964?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61964-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×440×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6964", "61964" ], "locale_variants": {} }, { "sku": "16064", "brand": "NTN", "manufacturer_designation": "16064", "series": "16000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 335, "static_load_kN": 440, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 34200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16064 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 64 by five gives the 320 mm bore; the 480 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 320 mm bore the ring mass is significant: heat 16064 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 320 mm bore shares the 480 mm outside diameter of the 6064 but is only 50 mm wide; a 6064 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 16064 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 50 mm-wide ring of 16064 drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 320 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 16064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 16064 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1200 r/min for 16064; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16064 at 335 kN dynamic (C) and 440 kN static (C0), 14.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 34200 g (34.2 kg), 16064 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×480×50 mm envelope of 16064 gives a D/d ratio of 1.50 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 335/440 kN load ratings, 14.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 34200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16064 on the 320×480×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16064 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 16064 bearing?", "a": "A 16064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 50 mm width (12.598 × 18.898 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16064 bore code work?", "a": "The last two digits of 16064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16064 mean?", "a": "A bare 16064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 16064?", "a": "NTN lists the open 16064 under the bare designation 16064; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Is 16064 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16064-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×480×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16064" ], "locale_variants": {} }, { "sku": "6064", "brand": "NTN", "manufacturer_designation": "6064", "series": "6000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 410, "static_load_kN": 530, "fatigue_load_limit_kN": 19.3, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 46100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6064 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 64 by five gives the 320 mm bore; the 480 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 320 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 320 mm bore uses a smaller 480 mm OD than a 6264; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6064 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6064 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 74 mm-wide ring of 6064 drags the lip and overheats it.", "The housing bore for the 480 mm OD should be round within IT7; an oval bore pinches the outer ring of 6064 and shows up later as two-point loaded raceway wear.", "The open 6064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 320 mm bore places 6064 in NTN's extra-large range; the pressed-steel cage is not recommended at this diameter and NTN supplies a machined brass cage (suffix M) as the standard offering. Speed ratings are low, housing alignment is critical, and oil lubrication with a defined relubrication interval is mandatory — consult NTN engineering before sizing.", "NTN lists the grease limiting speed at 1200 r/min for 6064; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 410 kN dynamic load rating (C) and 530 kN static (C0), 19.3 kN fatigue load limit Cu, 6064 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 46100 g (46.1 kg), 6064 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 320×480×74 mm envelope of 6064 gives a D/d ratio of 1.50 and 80.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 410/530 kN load ratings, 19.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 46100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6064 on the 320×480×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6064 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor." ], "faq": [ { "q": "What are the dimensions of a 6064 bearing?", "a": "A 6064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 74 mm width (12.598 × 18.898 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6064 mean?", "a": "A bare 6064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 320 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (480×74 mm, 80.0 mm radial section) at 320 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6064?", "a": "NTN lists the open 6064 under the bare designation 6064; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 320 mm bore envelope." }, { "q": "Does NTN offer 6064 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6064 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6064-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×480×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6064" ], "locale_variants": {} }, { "sku": "61868-NTN", "brand": "NTN", "manufacturer_designation": "6868", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 189, "static_load_kN": 236, "fatigue_load_limit_kN": 8.05, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61868 carries bore code 68 = 340 mm. Outside diameter 420 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 340 mm of 61868-NTN demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 340 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6268.", "The open 61868-NTN has no lubricant retention: grease escapes and contaminants migrate straight into the 340×420×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 340 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61868-NTN.", "The open 61868 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 61868 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1300 r/min for 61868; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 189 kN dynamic load rating (C) and 236 kN static (C0), 8.05 kN fatigue load limit Cu, 61868 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 11500 g (11.5 kg), 61868 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 340×420×38 mm envelope of 61868 gives a D/d ratio of 1.24 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 189/236 kN load ratings, 8.05 kN fatigue load limit Cu NTN lists the grease limiting speed at 1300 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 11500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6868 on the 340×420×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61868 in a rated drive.", "Standard catalogue stock of 61868 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "Order the C3 internal-clearance version (61868 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61868-NTN bearing?", "a": "A 61868-NTN deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61868-NTN be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 340 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61868-NTN need?", "a": "The open 61868-NTN is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61868?", "a": "NTN lists the open 61868 under the bare designation 6868; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "Does NTN offer 61868 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6868 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61868", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61868-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6868", "61868", "61868-NTN" ], "locale_variants": {} }, { "sku": "61968", "brand": "NTN", "manufacturer_designation": "6968", "series": "61900-series", "type": "deep_groove", "d_mm": 340, "D_mm": 460, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 325, "static_load_kN": 430, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 26200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61968 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 460 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 340 mm of 61968 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 340 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61968 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×460×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61968 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 460 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61968.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61968 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 61968 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1200 r/min for 61968; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61968 at 325 kN dynamic (C) and 430 kN static (C0), 14.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 26200 g (26.2 kg), 61968 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 340×460×56 mm envelope of 61968 gives a D/d ratio of 1.35 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 325/430 kN load ratings, 14.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 26200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6968 on the 340×460×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61968 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61968 is listed.", "Order the C3 internal-clearance version (61968 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61968 bearing?", "a": "A 61968 deep-groove ball bearing has a 340 mm bore, 460 mm outer diameter and 56 mm width (13.386 × 18.11 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61968 mean?", "a": "A bare 61968 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 340 mm bore?", "a": "619 is a thin section one step above 618: 460×56 mm with a 60.0 mm radial section at 340 mm bore; a 6268 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN order number for an open 61968?", "a": "NTN lists the open 61968 under the bare designation 6968; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "Is 6968 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61968-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×460×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6968", "61968" ], "locale_variants": {} }, { "sku": "16068", "brand": "NTN", "manufacturer_designation": "16068", "series": "16000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 380, "static_load_kN": 515, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 47100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "16068 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 68 by five gives the 340 mm bore; the 520 mm outside diameter and 57 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 340 mm bore the ring mass is significant: heat 16068 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 340 mm bore shares the 520 mm outside diameter of the 6068 but is only 57 mm wide; a 6068 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16068 units.", "Shaft and housing fillets must clear the bearing chamfer so the 57 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16068.", "The open 16068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 16068 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 16068; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16068 at 380 kN dynamic (C) and 515 kN static (C0), 17 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 47100 g (47.1 kg), 16068 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 340×520×57 mm envelope of 16068 gives a D/d ratio of 1.53 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 380/515 kN load ratings, 17 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 47100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16068 on the 340×520×57 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16068 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 16068 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 16068 bearing?", "a": "A 16068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 57 mm width (13.386 × 20.472 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16068 have?", "a": "Unless a clearance suffix says otherwise, 16068 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16068 and verify the residual clearance after mounting." }, { "q": "How should 16068 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 340 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16068?", "a": "NTN lists the open 16068 under the bare designation 16068; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "What cage does NTN fit in 16068?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "16068-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×520×57 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16068" ], "locale_variants": {} }, { "sku": "6068", "brand": "NTN", "manufacturer_designation": "6068", "series": "6000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 465, "static_load_kN": 610, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 61800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6068 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 520 mm outside diameter and 82 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 340 mm of 6068 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 340 mm bore uses a smaller 520 mm OD than a 6268; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6068 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6068 units.", "The housing bore for the 520 mm OD should be round within IT7; an oval bore pinches the outer ring of 6068 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6068.", "The open 6068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 340 mm bore places 6068 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 6068; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 465 kN dynamic load rating (C) and 610 kN static (C0), 21.9 kN fatigue load limit Cu, 6068 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 61800 g (61.8 kg), 6068 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 340×520×82 mm envelope of 6068 gives a D/d ratio of 1.53 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 465/610 kN load ratings, 21.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 61800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6068 on the 340×520×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6068 in a rated drive.", "Standard catalogue stock of 6068 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 6068 bearing?", "a": "A 6068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 82 mm width (13.386 × 20.472 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6068 need?", "a": "The open 6068 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6068 bore code work?", "a": "The last two digits of 6068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6068?", "a": "NTN lists the open 6068 under the bare designation 6068; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 340 mm bore envelope." }, { "q": "What cage does NTN fit in 6068?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6068-M", "equiv_brand": "SKF", "level": "full", "note": "Same 340×520×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6068" ], "locale_variants": {} }, { "sku": "61872", "brand": "NTN", "manufacturer_designation": "6872", "series": "61800-series", "type": "deep_groove", "d_mm": 360, "D_mm": 440, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 207, "static_load_kN": 258, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1200, "max_rpm": 1200, "weight_g": 12300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61872 carries bore code 72 = 360 mm. Outside diameter 440 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 360 mm of 61872 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 360 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6272.", "The open 61872 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×440×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61872 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61872-C3. No clearance suffix means normal CN clearance.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61872 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 61872 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1200 r/min for 61872; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 207 kN dynamic load rating (C) and 258 kN static (C0), 8.55 kN fatigue load limit Cu, 61872 is a heavy-load bearing for industrial gearboxes and large conveyors; NTN expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.", "At 12300 g (12.3 kg), 61872 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 360×440×38 mm envelope of 61872 gives a D/d ratio of 1.22 and only 40.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 207/258 kN load ratings, 8.55 kN fatigue load limit Cu NTN lists the grease limiting speed at 1200 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 12300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6872 on the 360×440×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61872 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61872 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61872 bearing?", "a": "A 61872 deep-groove ball bearing has a 360 mm bore, 440 mm outer diameter and 38 mm width (14.173 × 17.323 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61872 mean?", "a": "A bare 61872 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 360 mm bore?", "a": "618 is an extra-thin section: 440×38 mm, only 40.0 mm radial section at 360 mm bore, far smaller than a 6272, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN order number for an open 61872?", "a": "NTN lists the open 61872 under the bare designation 6872; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "What cage does NTN fit in 6872?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61872-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×440×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6872", "61872" ], "locale_variants": {} }, { "sku": "61972", "brand": "NTN", "manufacturer_designation": "6972", "series": "61900-series", "type": "deep_groove", "d_mm": 360, "D_mm": 480, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 330, "static_load_kN": 455, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61972 carries bore code 72 = 360 mm. Outside diameter 480 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 360 mm of 61972 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 360 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61972 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61972 units.", "Never mix components between two 61972 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 480 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61972.", "The open 61972 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 61972 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61972; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61972 at 330 kN dynamic (C) and 455 kN static (C0), 14.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 27500 g (27.5 kg), 61972 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 360×480×56 mm envelope of 61972 gives a D/d ratio of 1.33 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 330/455 kN load ratings, 14.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 27500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6972 on the 360×480×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61972 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61972 bearing?", "a": "A 61972 deep-groove ball bearing has a 360 mm bore, 480 mm outer diameter and 56 mm width (14.173 × 18.898 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61972 have?", "a": "Unless a clearance suffix says otherwise, 61972 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61972 and verify the residual clearance after mounting." }, { "q": "How should 61972 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61972?", "a": "NTN lists the open 61972 under the bare designation 6972; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "What cage does NTN fit in 6972?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61972-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×480×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6972", "61972" ], "locale_variants": {} }, { "sku": "16072", "brand": "NTN", "manufacturer_designation": "16072", "series": "16000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 390, "static_load_kN": 550, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 49300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 360 mm bore the ring mass is significant: heat 16072 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 360 mm bore shares the 540 mm outside diameter of the 6072 but is only 57 mm wide; a 6072 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "Storage matters for open bearings: 16072 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16072 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16072-C3. No clearance suffix means normal CN clearance.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 16072 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 16072; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 16072 at 390 kN dynamic (C) and 550 kN static (C0), 17.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 49300 g (49.3 kg), 16072 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 360×540×57 mm envelope of 16072 gives a D/d ratio of 1.50 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 390/550 kN load ratings, 17.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 49300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16072 on the 360×540×57 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16072 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (16072 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 16072 bearing?", "a": "A 16072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 57 mm width (14.173 × 21.26 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 16072 have?", "a": "Unless a clearance suffix says otherwise, 16072 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16072 and verify the residual clearance after mounting." }, { "q": "How should 16072 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 16072?", "a": "NTN lists the open 16072 under the bare designation 16072; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "Is 16072 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "16072-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×540×57 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16072" ], "locale_variants": {} }, { "sku": "6072", "brand": "NTN", "manufacturer_designation": "6072", "series": "6000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 485, "static_load_kN": 670, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 64700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6072 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 72 by five gives the 360 mm bore; the 540 mm outside diameter and 82 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 360 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 360 mm of 6072 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 360 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6272 before committing to the smaller envelope.", "The open 6072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6072 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6072 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 360 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360 mm bore places 6072 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 6072; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "At 485 kN dynamic load rating (C) and 670 kN static (C0), 23 kN fatigue load limit Cu, 6072 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 64700 g (64.7 kg), 6072 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 360×540×82 mm envelope of 6072 gives a D/d ratio of 1.50 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 485/670 kN load ratings, 23 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 64700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6072 on the 360×540×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6072 in a rated drive.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service.", "Order the C3 internal-clearance version (6072 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6072 bearing?", "a": "A 6072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 82 mm width (14.173 × 21.26 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6072 have?", "a": "Unless a clearance suffix says otherwise, 6072 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6072 and verify the residual clearance after mounting." }, { "q": "How should 6072 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 360 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6072?", "a": "NTN lists the open 6072 under the bare designation 6072; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 360 mm bore envelope." }, { "q": "Is 6072 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "6072-M", "equiv_brand": "SKF", "level": "full", "note": "Same 360×540×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6072" ], "locale_variants": {} }, { "sku": "61876", "brand": "NTN", "manufacturer_designation": "6876", "series": "61800-series", "type": "deep_groove", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 256, "static_load_kN": 340, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 19700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61876 carries bore code 76 = 380 mm. Outside diameter 480 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 380 mm of 61876 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 50.0 mm of radial section separates bore and OD on the 618xx series at 380 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6276.", "The open 61876 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×480×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61876 units.", "A 380 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61876-C3. No clearance suffix means normal CN clearance.", "The open 61876 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 61876 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61876; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61876 at 256 kN dynamic (C) and 340 kN static (C0), 10.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 19700 g (19.7 kg), 61876 is a heavy bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.", "The 380×480×46 mm envelope of 61876 gives a D/d ratio of 1.26 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 256/340 kN load ratings, 10.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 19700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6876 on the 380×480×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61876 in a rated drive.", "Order the C3 internal-clearance version (61876 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61876 is listed." ], "faq": [ { "q": "What are the dimensions of a 61876 bearing?", "a": "A 61876 deep-groove ball bearing has a 380 mm bore, 480 mm outer diameter and 46 mm width (14.961 × 18.898 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61876 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61876 uses the same ISO 15 envelope (380×480×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61876 have?", "a": "Unless a clearance suffix says otherwise, 61876 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61876 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61876?", "a": "NTN lists the open 61876 under the bare designation 6876; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Is 6876 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61876-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 380×480×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6876", "61876" ], "locale_variants": {} }, { "sku": "61976", "brand": "NTN", "manufacturer_designation": "6976", "series": "61900-series", "type": "deep_groove", "d_mm": 380, "D_mm": 520, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 360, "static_load_kN": 510, "fatigue_load_limit_kN": 15.9, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 39800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61976 carries bore code 76 = 380 mm. Outside diameter 520 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 380 mm of 61976 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (70.0 mm section height at 380 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61976 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61976 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61976 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 61976 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at 1100 r/min for 61976; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61976 at 360 kN dynamic (C) and 510 kN static (C0), 15.9 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 39800 g (39.8 kg), 61976 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 380×520×65 mm envelope of 61976 gives a D/d ratio of 1.37 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 360/510 kN load ratings, 15.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 39800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6976 on the 380×520×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61976 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61976 is listed." ], "faq": [ { "q": "What are the dimensions of a 61976 bearing?", "a": "A 61976 deep-groove ball bearing has a 380 mm bore, 520 mm outer diameter and 65 mm width (14.961 × 20.472 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61976 have?", "a": "Unless a clearance suffix says otherwise, 61976 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61976 and verify the residual clearance after mounting." }, { "q": "How should 61976 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 380 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61976?", "a": "NTN lists the open 61976 under the bare designation 6976; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Is 6976 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61976-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 380×520×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6976", "61976" ], "locale_variants": {} }, { "sku": "6076", "brand": "NTN", "manufacturer_designation": "6076", "series": "6000-series", "type": "deep_groove", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 505, "static_load_kN": 725, "fatigue_load_limit_kN": 24.1, "limiting_speed_rpm": 990, "max_rpm": 990, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6076 carries bore code 76 = 380 mm. Outside diameter 560 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 380 mm of 6076 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 380 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6276 before committing to the smaller envelope.", "Storage matters for open bearings: 6076 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6076 units.", "The housing bore for the 560 mm OD should be round within IT7; an oval bore pinches the outer ring of 6076 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 560 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6076.", "The open 6076 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380 mm bore places 6076 in NTN's maximum-size range at the lower end; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NTN supplies a machined brass cage (suffix M) and expects oil lubrication; do not use catalogue grease speed figures for this size without an NTN engineering review.", "NTN lists the grease limiting speed at only 990 r/min for 6076; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 505 kN dynamic load rating (C) and 725 kN static (C0), 24.1 kN fatigue load limit Cu, 6076 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 67500 g (67.5 kg), 6076 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 380×560×82 mm envelope of 6076 gives a D/d ratio of 1.47 and 90.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 505/725 kN load ratings, 24.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 990 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 67500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6076 on the 380×560×82 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6076 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Order the C3 internal-clearance version (6076 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 6076 bearing?", "a": "A 6076 deep-groove ball bearing has a 380 mm bore, 560 mm outer diameter and 82 mm width (14.961 × 22.047 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6076 need?", "a": "The open 6076 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6076 bore code work?", "a": "The last two digits of 6076 are bore code 76, giving 76 × 5 = 380 mm bore. The 560 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 6076?", "a": "NTN lists the open 6076 under the bare designation 6076; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 380 mm bore envelope." }, { "q": "Does NTN offer 6076 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6076 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6076-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 380×560×82 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6076" ], "locale_variants": {} }, { "sku": "61880", "brand": "NTN", "manufacturer_designation": "6880", "series": "61800-series", "type": "deep_groove", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 340, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 20600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61880 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 80 by five gives the 400 mm bore; the 500 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 400 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 400 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6280.", "The open 61880 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×500×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61880 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 400 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61880.", "The open 61880 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 61880 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at 1100 r/min for 61880; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61880 at 251 kN dynamic (C) and 340 kN static (C0), 10.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 20600 g (20.6 kg), 61880 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 400×500×46 mm envelope of 61880 gives a D/d ratio of 1.25 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 251/340 kN load ratings, 10.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 1100 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 20600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6880 on the 400×500×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61880 in a rated drive.", "Standard catalogue stock of 61880 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 61880 is listed." ], "faq": [ { "q": "What are the dimensions of a 61880 bearing?", "a": "A 61880 deep-groove ball bearing has a 400 mm bore, 500 mm outer diameter and 46 mm width (15.748 × 19.685 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 400 mm bore?", "a": "618 is an extra-thin section: 500×46 mm, only 50.0 mm radial section at 400 mm bore, far smaller than a 6280, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61880 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61880 uses the same ISO 15 envelope (400×500×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61880?", "a": "NTN lists the open 61880 under the bare designation 6880; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 61880 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6880 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61880-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 400×500×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6880", "61880" ], "locale_variants": {} }, { "sku": "61980", "brand": "NTN", "manufacturer_designation": "6980", "series": "61900-series", "type": "deep_groove", "d_mm": 400, "D_mm": 540, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 370, "static_load_kN": 535, "fatigue_load_limit_kN": 16.4, "limiting_speed_rpm": 990, "max_rpm": 990, "weight_g": 41600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61980 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 80 by five gives the 400 mm bore; the 540 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 400 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 400 mm bore (70.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61980 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61980 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 400 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61980.", "The open 61980 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 61980 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 990 r/min for 61980; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61980 at 370 kN dynamic (C) and 535 kN static (C0), 16.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 41600 g (41.6 kg), 61980 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 400×540×65 mm envelope of 61980 gives a D/d ratio of 1.35 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 370/535 kN load ratings, 16.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 990 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 41600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6980 on the 400×540×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61980 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61980 bearing?", "a": "A 61980 deep-groove ball bearing has a 400 mm bore, 540 mm outer diameter and 65 mm width (15.748 × 21.26 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 400 mm bore?", "a": "619 is a thin section one step above 618: 540×65 mm with a 70.0 mm radial section at 400 mm bore; a 6280 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61980 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61980 uses the same ISO 15 envelope (400×540×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61980?", "a": "NTN lists the open 61980 under the bare designation 6980; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 61980 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6980 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61980-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 400×540×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6980", "61980" ], "locale_variants": {} }, { "sku": "6080", "brand": "NTN", "manufacturer_designation": "6080", "series": "6000-series", "type": "deep_groove", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 565, "static_load_kN": 825, "fatigue_load_limit_kN": 26.9, "limiting_speed_rpm": 930, "max_rpm": 930, "weight_g": 87600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6080 carries bore code 80 = 400 mm. Outside diameter 600 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 400 mm of 6080 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 400 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6280 before committing to the smaller envelope.", "Storage matters for open bearings: 6080 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6080 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 600 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6080.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6080 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 400 mm bore places 6080 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 930 r/min for 6080; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 565 kN dynamic load rating (C) and 825 kN static (C0), 26.9 kN fatigue load limit Cu, 6080 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 87600 g (87.6 kg), 6080 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 400×600×90 mm envelope of 6080 gives a D/d ratio of 1.50 and 100.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 565/825 kN load ratings, 26.9 kN fatigue load limit Cu NTN lists the grease limiting speed at 930 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 87600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6080 on the 400×600×90 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6080 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6080 is listed." ], "faq": [ { "q": "What are the dimensions of a 6080 bearing?", "a": "A 6080 deep-groove ball bearing has a 400 mm bore, 600 mm outer diameter and 90 mm width (15.748 × 23.622 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6080 have?", "a": "Unless a clearance suffix says otherwise, 6080 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6080 and verify the residual clearance after mounting." }, { "q": "How should 6080 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 400 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 6080?", "a": "NTN lists the open 6080 under the bare designation 6080; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 400 mm bore envelope." }, { "q": "Does NTN offer 6080 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6080 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "6080-M", "equiv_brand": "SKF", "level": "full", "note": "Same 400×600×90 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6080" ], "locale_variants": {} }, { "sku": "61884", "brand": "NTN", "manufacturer_designation": "6884", "series": "61800-series", "type": "deep_groove", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 288, "static_load_kN": 405, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 21600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61884 carries bore code 84 = 420 mm. Outside diameter 520 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 420 mm of 61884 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 420 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6284.", "The open 61884 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×520×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61884 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 420 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 61884 drags the lip and overheats it.", "The open 61884 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 61884 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at 1000 r/min for 61884; this is a large-section size where the pressed-steel cage is speed-limited — NTN recommends the machined brass cage (suffix M) and oil lubrication for any continuous operation above this figure.", "NTN rates 61884 at 288 kN dynamic (C) and 405 kN static (C0), 12.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 21600 g (21.6 kg), 61884 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 420×520×46 mm envelope of 61884 gives a D/d ratio of 1.24 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 288/405 kN load ratings, 12.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 1000 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6884 on the 420×520×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61884 in a rated drive.", "Two NTN bearings of the same designation from different production lots can carry minor internal-geometry revisions; for paired or preloaded arrangements on one shaft, order a single lot through the NTN distributor.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 61884 bearing?", "a": "A 61884 deep-groove ball bearing has a 420 mm bore, 520 mm outer diameter and 46 mm width (16.535 × 20.472 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61884 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61884 uses the same ISO 15 envelope (420×520×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61884 have?", "a": "Unless a clearance suffix says otherwise, 61884 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61884 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61884?", "a": "NTN lists the open 61884 under the bare designation 6884; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "Does NTN offer 61884 with C3 clearance?", "a": "Yes — most NTN deep-groove sizes can be ordered with C3 internal clearance (suffix C3 follows the seal code). C3 suits tight fits and hot shafts; for normal fits at moderate temperature the standard CN clearance of 6884 is the correct choice." } ], "cross_ref": [ { "equiv_sku": "61884-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×520×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6884", "61884" ], "locale_variants": {} }, { "sku": "61984", "brand": "NTN", "manufacturer_designation": "6984", "series": "61900-series", "type": "deep_groove", "d_mm": 420, "D_mm": 560, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 380, "static_load_kN": 560, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 940, "max_rpm": 940, "weight_g": 43400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61984 carries bore code 84 = 420 mm. Outside diameter 560 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 420 mm bore the ring mass is significant: heat 61984 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (70.0 mm section height at 420 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61984 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61984 units.", "Never mix components between two 61984 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 61984 drags the lip and overheats it.", "The open 61984 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 61984 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 940 r/min for 61984; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61984 at 380 kN dynamic (C) and 560 kN static (C0), 16.8 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 43400 g (43.4 kg), 61984 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 420×560×65 mm envelope of 61984 gives a D/d ratio of 1.33 and only 70.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 380/560 kN load ratings, 16.8 kN fatigue load limit Cu NTN lists the grease limiting speed at 940 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 43400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6984 on the 420×560×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61984 in a rated drive.", "Order the C3 internal-clearance version (61984 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61984 bearing?", "a": "A 61984 deep-groove ball bearing has a 420 mm bore, 560 mm outer diameter and 65 mm width (16.535 × 22.047 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61984 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 420 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61984 need?", "a": "The open 61984 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the NTN order number for an open 61984?", "a": "NTN lists the open 61984 under the bare designation 6984; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "Is 6984 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61984-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 420×560×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6984", "61984" ], "locale_variants": {} }, { "sku": "6084", "brand": "NTN", "manufacturer_designation": "6084", "series": "6000-series", "type": "deep_groove", "d_mm": 420, "D_mm": 620, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 590, "static_load_kN": 895, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 880, "max_rpm": 880, "weight_g": 91100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "6084 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 84 by five gives the 420 mm bore; the 620 mm outside diameter and 90 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 420 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 420 mm of 6084 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 420 mm bore uses a smaller 620 mm OD than a 6284; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6084 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×620×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6084 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 620 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6084.", "The open 6084 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 420 mm bore places 6084 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 880 r/min for 6084; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 590 kN dynamic load rating (C) and 895 kN static (C0), 28.3 kN fatigue load limit Cu, 6084 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 91100 g (91.1 kg), 6084 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 420×620×90 mm envelope of 6084 gives a D/d ratio of 1.48 and 100.0 mm radial section height — this thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.", "The 590/895 kN load ratings, 28.3 kN fatigue load limit Cu NTN lists the grease limiting speed at 880 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 91100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6084 on the 420×620×90 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6084 in a rated drive.", "NTN's pressed-steel cage (no cage suffix) is the quiet standard for this size; for sustained running close to the limiting speed or for heavy shock duty, ask the NTN channel whether a machined-cage execution of 6084 is listed.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field." ], "faq": [ { "q": "What are the dimensions of a 6084 bearing?", "a": "A 6084 deep-groove ball bearing has a 420 mm bore, 620 mm outer diameter and 90 mm width (16.535 × 24.409 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6084 mean?", "a": "A bare 6084 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 420 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (620×90 mm, 100.0 mm radial section) at 420 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN order number for an open 6084?", "a": "NTN lists the open 6084 under the bare designation 6084; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 420 mm bore envelope." }, { "q": "What cage does NTN fit in 6084?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "6084-M", "equiv_brand": "SKF", "level": "partial", "note": "Same 420×620×90 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6084" ], "locale_variants": {} }, { "sku": "61888", "brand": "NTN", "manufacturer_designation": "6888", "series": "61800-series", "type": "deep_groove", "d_mm": 440, "D_mm": 540, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 292, "static_load_kN": 420, "fatigue_load_limit_kN": 12.6, "limiting_speed_rpm": 950, "max_rpm": 950, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61888 carries bore code 88 = 440 mm. Outside diameter 540 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 440 mm bore the ring mass is significant: heat 61888 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 440 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6288.", "The open 61888 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×540×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61888 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "A 440 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61888 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 440 mm bore places 61888 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 950 r/min for 61888; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61888 at 292 kN dynamic (C) and 420 kN static (C0), 12.6 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 22500 g (22.5 kg), 61888 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 440×540×46 mm envelope of 61888 gives a D/d ratio of 1.23 and only 50.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 292/420 kN load ratings, 12.6 kN fatigue load limit Cu NTN lists the grease limiting speed at 950 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 22500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6888 on the 440×540×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61888 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61888 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61888 bearing?", "a": "A 61888 deep-groove ball bearing has a 440 mm bore, 540 mm outer diameter and 46 mm width (17.323 × 21.26 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61888 bore code work?", "a": "The last two digits of 61888 are bore code 88, giving 88 × 5 = 440 mm bore. The 540 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61888 mean?", "a": "A bare 61888 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61888?", "a": "NTN lists the open 61888 under the bare designation 6888; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 440 mm bore envelope." }, { "q": "What cage does NTN fit in 6888?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61888-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×540×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6888", "61888" ], "locale_variants": {} }, { "sku": "61988", "brand": "NTN", "manufacturer_designation": "6988", "series": "61900-series", "type": "deep_groove", "d_mm": 440, "D_mm": 600, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 405, "static_load_kN": 615, "fatigue_load_limit_kN": 18, "limiting_speed_rpm": 890, "max_rpm": 890, "weight_g": 60000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61988 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 88 by five gives the 440 mm bore; the 600 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 440 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 440 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61988 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×600×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61988 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 74 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61988 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 440 mm bore places 61988 in NTN's upper maximum-size range; at this diameter the bearing mass is substantial and mounting requires induction heating of the inner ring (max 120 °C) with a mechanical puller. NTN supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval.", "NTN lists the grease limiting speed at only 890 r/min for 61988; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 405 kN dynamic load rating (C) and 615 kN static (C0), 18 kN fatigue load limit Cu, 61988 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 60000 g (60.0 kg), 61988 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 440×600×74 mm envelope of 61988 gives a D/d ratio of 1.36 and only 80.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 405/615 kN load ratings, 18 kN fatigue load limit Cu NTN lists the grease limiting speed at 890 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 60000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6988 on the 440×600×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61988 in a rated drive.", "Standard catalogue stock of 61988 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61988 bearing?", "a": "A 61988 deep-groove ball bearing has a 440 mm bore, 600 mm outer diameter and 74 mm width (17.323 × 23.622 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61988 have?", "a": "Unless a clearance suffix says otherwise, 61988 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61988 and verify the residual clearance after mounting." }, { "q": "How should 61988 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 440 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the NTN order number for an open 61988?", "a": "NTN lists the open 61988 under the bare designation 6988; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 440 mm bore envelope." }, { "q": "Is 6988 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61988-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 440×600×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6988", "61988" ], "locale_variants": {} }, { "sku": "61892", "brand": "NTN", "manufacturer_designation": "6892", "series": "61800-series", "type": "deep_groove", "d_mm": 460, "D_mm": 580, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 350, "static_load_kN": 515, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 900, "max_rpm": 900, "weight_g": 34800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61892 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 92 by five gives the 460 mm bore; the 580 mm outside diameter and 56 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 460 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 460 mm bore the ring mass is significant: heat 61892 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 60.0 mm of radial section separates bore and OD on the 618xx series at 460 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6292.", "The open 61892 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×580×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61892 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61892-C3. No clearance suffix means normal CN clearance.", "The open 61892 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 460 mm bore places 61892 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 900 r/min for 61892; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61892 at 350 kN dynamic (C) and 515 kN static (C0), 15.1 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 34800 g (34.8 kg), 61892 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 460×580×56 mm envelope of 61892 gives a D/d ratio of 1.26 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 350/515 kN load ratings, 15.1 kN fatigue load limit Cu NTN lists the grease limiting speed at 900 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 34800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6892 on the 460×580×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61892 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Order the C3 internal-clearance version (61892 with C3 after the seal code) when the shaft fit is tight or the shaft-to-housing temperature gradient exceeds roughly 10 °C — the residual clearance after mounting, not the catalogue CN figure, decides service life." ], "faq": [ { "q": "What are the dimensions of a 61892 bearing?", "a": "A 61892 deep-groove ball bearing has a 460 mm bore, 580 mm outer diameter and 56 mm width (18.11 × 22.835 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61892 bore code work?", "a": "The last two digits of 61892 are bore code 92, giving 92 × 5 = 460 mm bore. The 580 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61892 mean?", "a": "A bare 61892 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the NTN order number for an open 61892?", "a": "NTN lists the open 61892 under the bare designation 6892; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 460 mm bore envelope." }, { "q": "Is 6892 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61892-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×580×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6892", "61892" ], "locale_variants": {} }, { "sku": "61992", "brand": "NTN", "manufacturer_designation": "6992", "series": "61900-series", "type": "deep_groove", "d_mm": 460, "D_mm": 620, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 415, "static_load_kN": 645, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 62200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "61992 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 92 by five gives the 460 mm bore; the 620 mm outside diameter and 74 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 460 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 460 mm bore (80.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61992 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×620×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61992 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 620 mm OD should be round within IT7; an oval bore pinches the outer ring of 61992 and shows up later as two-point loaded raceway wear.", "Never mix components between two 61992 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61992 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 460 mm bore places 61992 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 850 r/min for 61992; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 415 kN dynamic load rating (C) and 645 kN static (C0), 18.5 kN fatigue load limit Cu, 61992 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 62200 g (62.2 kg), 61992 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 460×620×74 mm envelope of 61992 gives a D/d ratio of 1.35 and only 80.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 415/645 kN load ratings, 18.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 850 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 62200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6992 on the 460×620×74 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61992 in a rated drive.", "Standard catalogue stock of 61992 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61992 bearing?", "a": "A 61992 deep-groove ball bearing has a 460 mm bore, 620 mm outer diameter and 74 mm width (18.11 × 24.409 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61992 need?", "a": "The open 61992 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61992 bore code work?", "a": "The last two digits of 61992 are bore code 92, giving 92 × 5 = 460 mm bore. The 620 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the NTN order number for an open 61992?", "a": "NTN lists the open 61992 under the bare designation 6992; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 460 mm bore envelope." }, { "q": "Is 6992 a current NTN production size?", "a": "The NTN 2203-series catalogue lists it as a standard size; availability of specific seal executions (ZZ, LLB/LLF, LLH, LLU) varies by region and stock — confirm with an NTN distributor before specifying spares." } ], "cross_ref": [ { "equiv_sku": "61992-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 460×620×74 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6992", "61992" ], "locale_variants": {} }, { "sku": "61896", "brand": "NTN", "manufacturer_designation": "6896", "series": "61800-series", "type": "deep_groove", "d_mm": 480, "D_mm": 600, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 355, "static_load_kN": 540, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 860, "max_rpm": 860, "weight_g": 36200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61896 carries bore code 96 = 480 mm. Outside diameter 600 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 480 mm bore the ring mass is significant: heat 61896 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 60.0 mm of radial section separates bore and OD on the 618xx series at 480 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6296.", "Storage matters for open bearings: 61896 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61896 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The housing bore for the 600 mm OD should be round within IT7; an oval bore pinches the outer ring of 61896 and shows up later as two-point loaded raceway wear.", "The open 61896 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480 mm bore places 61896 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 860 r/min for 61896; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "NTN rates 61896 at 355 kN dynamic (C) and 540 kN static (C0), 15.4 kN fatigue load limit Cu; this is an upper heavy-load rating where the pressed-steel cage is not recommended — NTN supplies a machined brass cage (suffix M) and the static C0 must be verified against any shock or lifting loads the bearing sees during mounting.", "At 36200 g (36.2 kg), 61896 is a very heavy bearing where handling and mounting method directly affect service life; NTN requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the machined brass cage.", "The 480×600×56 mm envelope of 61896 gives a D/d ratio of 1.25 and only 60.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 355/540 kN load ratings, 15.4 kN fatigue load limit Cu NTN lists the grease limiting speed at 860 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 36200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6896 on the 480×600×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61896 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "Standard catalogue stock of 61896 is the general-purpose execution; for low-noise motor duty NTN offers low-torque seal and special-grease variants in this size class, which are separate order numbers." ], "faq": [ { "q": "What are the dimensions of a 61896 bearing?", "a": "A 61896 deep-groove ball bearing has a 480 mm bore, 600 mm outer diameter and 56 mm width (18.898 × 23.622 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 480 mm bore?", "a": "618 is an extra-thin section: 600×56 mm, only 60.0 mm radial section at 480 mm bore, far smaller than a 6296, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61896 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61896 uses the same ISO 15 envelope (480×600×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the NTN order number for an open 61896?", "a": "NTN lists the open 61896 under the bare designation 6896; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 480 mm bore envelope." }, { "q": "What cage does NTN fit in 6896?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61896-MA", "equiv_brand": "SKF", "level": "partial", "note": "Same 480×600×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6896", "61896" ], "locale_variants": {} }, { "sku": "61996", "brand": "NTN", "manufacturer_designation": "6996", "series": "61900-series", "type": "deep_groove", "d_mm": 480, "D_mm": 650, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 480, "static_load_kN": 770, "fatigue_load_limit_kN": 21.5, "limiting_speed_rpm": 810, "max_rpm": 810, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61996 carries bore code 96 = 480 mm. Outside diameter 650 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (85.0 mm section height at 480 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61996 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×650×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61996 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61996-C3. No clearance suffix means normal CN clearance.", "The open 61996 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480 mm bore places 61996 near the top of NTN's single-row deep-groove range; the pressed-steel cage is not viable at this diameter and NTN supplies a machined brass cage (suffix M). Housing stiffness and shaft alignment are critical, and the grease limiting speed is very low — specify oil lubrication and confirm the relubrication interval with NTN engineering.", "NTN lists the grease limiting speed at only 810 r/min for 61996; this is a very large or heavy-section size where centrifugal force and cage inertia cap the speed — for higher shaft speeds either step to a smaller bearing on the same bore or consult NTN for an oil-lubricated, machined-cage variant.", "At 480 kN dynamic load rating (C) and 770 kN static (C0), 21.5 kN fatigue load limit Cu, 61996 is a very-heavy-load bearing for large industrial gearboxes and steel-mill equipment; NTN supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture the shock and misalignment loads at this rating.", "At 73000 g (73.0 kg), 61996 is an extremely heavy bearing at the top of the single-row deep-groove range; NTN mandates induction heating (max 120 °C), a dedicated lifting fixture, and a machined brass cage (suffix M). Consult NTN engineering for the mounting and handling procedure before installation.", "The 480×650×78 mm envelope of 61996 gives a D/d ratio of 1.35 and only 85.0 mm radial section height — this is an ultra-thin section where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.", "The 480/770 kN load ratings, 21.5 kN fatigue load limit Cu NTN lists the grease limiting speed at 810 r/min for this designation; oil-mist or jet lubrication raises the ceiling but requires a sealed-housing review. and 73000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6996 on the 480×650×78 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61996 in a rated drive.", "Factory-fill grease in NTN sealed units is a general-duty lithium-soap grease; food-grade, low-temperature and high-temperature fills are request options at order time, because LLU/LLB units are not meant to be opened and re-greased in the field.", "NTN date-codes its packaging; rotate stock first-in-first-out, because the grease inside sealed units ages on the shelf — after three to five years of storage, check the grease condition before putting the bearing into service." ], "faq": [ { "q": "What are the dimensions of a 61996 bearing?", "a": "A 61996 deep-groove ball bearing has a 480 mm bore, 650 mm outer diameter and 78 mm width (18.898 × 25.591 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61996 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61996 uses the same ISO 15 envelope (480×650×78 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61996 have?", "a": "Unless a clearance suffix says otherwise, 61996 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61996 and verify the residual clearance after mounting." }, { "q": "What is the NTN order number for an open 61996?", "a": "NTN lists the open 61996 under the bare designation 6996; protected versions use suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal) on the same 480 mm bore envelope." }, { "q": "What cage does NTN fit in 6996?", "a": "Standard is a pressed-steel cage with no suffix; larger sizes or shock-loaded duty can be supplied with a machined brass cage (suffix M) as a separate order number. The catalogue figures quoted here are for the pressed-steel execution." } ], "cross_ref": [ { "equiv_sku": "61996-MA", "equiv_brand": "SKF", "level": "full", "note": "Same 480×650×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6996", "61996" ], "locale_variants": {} }, { "sku": "6200", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6200 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "The open 6200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6200 units.", "The housing bore for the 30 mm OD should be round within IT7; an oval bore pinches the outer ring of 6200 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6200 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6200-2Z (shields) and 6200-2RSH (contact seals), not suffix-free 6200.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200 bearing?", "a": "A 6200 deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6200 have?", "a": "Unless a clearance suffix says otherwise, 6200 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting." }, { "q": "How should 6200 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200 need?", "a": "The open 6200 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6200?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200 — the open (unsealed) execution, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 36000 r/min, mass 31 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6200", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6200-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 6200 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6200-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6200-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6200-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6200-2Z (one shield: 6200-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6200-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6200-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-ZZ bearing?", "a": "A 6200-ZZ deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6200-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200-ZZ need?", "a": "6200-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6200-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2Z — two non-contact sheet-metal shields, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-ZZ." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2Z", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6200-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6200-2RS (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6200-2RS runs slower and cooler-limited than the open 6200; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6200-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6200-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 6200-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6200-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed. The single-seal catalogue number is 6200-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6200-RSH exists for arrangements that lubricate through the open side; fitting 6200-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-2RS bearing?", "a": "A 6200-2RS deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6200-2RS need?", "a": "6200-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6200 with a housing grease fitting instead." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6200-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6200-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSH — two contact elastomer seals over a lifetime grease fill, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-2RS." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2RSH", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "The open 6201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6201 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6201 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6201-2Z (shields) and 6201-2RSH (contact seals), not suffix-free 6201.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201 bearing?", "a": "A 6201 deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6201 have?", "a": "Unless a clearance suffix says otherwise, 6201 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6201 need?", "a": "The open 6201 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6201?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201 — the open (unsealed) execution, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 32000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6201", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6201-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 6201-ZZ (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 12 mm bore the 62xx light series is the workhorse section; its 32×10 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6201-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6201-2RS for that.", "Do not wash 6201-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6201-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6201-2Z (one shield: 6201-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6201-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6201-2Z for high-contamination positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-ZZ bearing?", "a": "A 6201-ZZ deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6201 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6201-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6201-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6201-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2Z — two non-contact sheet-metal shields, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-ZZ." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2Z", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6201-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6201-2RS runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6201-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6201-2RS and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6201-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6201-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6201-RSH exists for arrangements that lubricate through the open side; fitting 6201-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-2RS bearing?", "a": "A 6201-2RS deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6201 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6201-2RS have?", "a": "Unless a clearance suffix says otherwise, 6201-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6201-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSH — two contact elastomer seals over a lifetime grease fill, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 15000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-2RS." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2RSH", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6202 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6202 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 6202 drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6202.", "The open 6202 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6202-2Z (shields) and 6202-2RSH (contact seals), not suffix-free 6202.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202 bearing?", "a": "A 6202 deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6202 mean?", "a": "A bare 6202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "Are 6202 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6202 uses the same ISO 15 envelope (15×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6202?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202 — the open (unsealed) execution, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 28000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6202", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6202-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6202-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6202-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6202-ZZ.", "SKF spells the shielded version 6202-2Z (one shield: 6202-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6202-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6202-2Z for high-contamination positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-ZZ bearing?", "a": "A 6202-ZZ deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6202-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6202-ZZ need?", "a": "6202-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6202-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2Z — two non-contact sheet-metal shields, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 48 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-ZZ." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2Z", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6202-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6202-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6202-2RS runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6202-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6202-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6202-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed. The single-seal catalogue number is 6202-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6202-RSH exists for arrangements that lubricate through the open side; fitting 6202-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-2RS bearing?", "a": "A 6202-2RS deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6202-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "Are 6202 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6202 uses the same ISO 15 envelope (15×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6202-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSH — two contact elastomer seals over a lifetime grease fill, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-2RS." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2RSH", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 65, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6203 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6203 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6203-2Z (shields) and 6203-2RSH (contact seals), not suffix-free 6203.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203 bearing?", "a": "A 6203 deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6203 mean?", "a": "A bare 6203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "Are 6203 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6203 uses the same ISO 15 envelope (17×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6203?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203 — the open (unsealed) execution, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 24000 r/min, mass 65 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726203-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726203-2RS1 is a standard-inner-ring insert on the same 17x40x12 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6203", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 68, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6203-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6203-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6203-2RS for that.", "Shielded 6203-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 40 mm OD should be round within IT7; an oval bore pinches the outer ring of 6203-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6203-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6203-2Z (one shield: 6203-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6203-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6203-2Z for high-contamination positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-ZZ bearing?", "a": "A 6203-ZZ deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6203-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "Are 6203 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6203 uses the same ISO 15 envelope (17×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6203-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2Z — two non-contact sheet-metal shields, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 68 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-ZZ." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6203-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6203-2RS runs slower and cooler-limited than the open 6203; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6203-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6203-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6203-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6203-RSH exists for arrangements that lubricate through the open side; fitting 6203-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-2RS bearing?", "a": "A 6203-2RS deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6203-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6203-2RS need?", "a": "6203-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6203 with a housing grease fitting instead." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6203-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSH — two contact elastomer seals over a lifetime grease fill, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 12000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-2RS." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6204 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6204 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6204 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6204 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6204 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6204-2Z (shields) and 6204-2RSH (contact seals), not suffix-free 6204.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204 bearing?", "a": "A 6204 deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6204 mean?", "a": "A bare 6204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204 — the open (unsealed) execution, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 20000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726204-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726204-2RS1 is a standard-inner-ring insert on the same 20x47x14 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6204", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6204-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-ZZ.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6204-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6204-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 14 mm-wide ring of 6204-ZZ drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6204-ZZ.", "SKF spells the shielded version 6204-2Z (one shield: 6204-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6204-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6204-2Z for high-contamination positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-ZZ bearing?", "a": "A 6204-ZZ deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6204-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2Z — two non-contact sheet-metal shields, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-ZZ." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2Z", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6204-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 20 mm shaft for 6204 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6204-2RS runs slower and cooler-limited than the open 6204; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6204-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6204-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6204-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6204-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6204-RSH exists for arrangements that lubricate through the open side; fitting 6204-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-2RS bearing?", "a": "A 6204-2RS deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-2RS have?", "a": "Unless a clearance suffix says otherwise, 6204-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSH — two contact elastomer seals over a lifetime grease fill, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 10000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-2RS." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2RSH", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6205.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "The open 6205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6205 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6205 and shows up later as two-point loaded raceway wear.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6205 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6205-2Z (shields) and 6205-2RSH (contact seals), not suffix-free 6205.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205 bearing?", "a": "A 6205 deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6205 mean?", "a": "A bare 6205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "Are 6205 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6205?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205 — the open (unsealed) execution, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 18000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726205-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726205-2RS1 is a standard-inner-ring insert on the same 25x52x15 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6205", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6205-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 25 mm bore the 62xx light series is the workhorse section; its 52×15 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6205-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6205-2RS for that.", "Shielded 6205-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6205-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-ZZ.", "SKF spells the shielded version 6205-2Z (one shield: 6205-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6205-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6205-2Z for high-contamination positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-ZZ bearing?", "a": "A 6205-ZZ deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "Are 6205 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6205-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6205-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6205-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2Z — two non-contact sheet-metal shields, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-ZZ." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2Z", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6205-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6205-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6205-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6205-2RS.", "SKF catalogues the contact-sealed version as 6205-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 28000 r/min thermal reference speed. The single-seal catalogue number is 6205-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6205-RSH exists for arrangements that lubricate through the open side; fitting 6205-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-2RS bearing?", "a": "A 6205-2RS deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6205-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6205-2RS need?", "a": "6205-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6205 with a housing grease fitting instead." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6205-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSH — two contact elastomer seals over a lifetime grease fill, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 8500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-2RS." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2RSH", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The open 6206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6206 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6206 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6206 and shows up later as two-point loaded raceway wear.", "The open 6206 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6206-2Z (shields) and 6206-2RSH (contact seals), not suffix-free 6206.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206 bearing?", "a": "A 6206 deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6206 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6206 need?", "a": "The open 6206 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6206?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206 — the open (unsealed) execution, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 15000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726206-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726206-2RS1 is a standard-inner-ring insert on the same 30x62x16 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6206", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6206-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6206-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6206-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6206-ZZ and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6206-2Z (one shield: 6206-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6206-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6206-2Z for high-contamination positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-ZZ bearing?", "a": "A 6206-ZZ deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6206 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6206 uses the same ISO 15 envelope (30×62×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6206-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6206-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6206 and verify the residual clearance after mounting." }, { "q": "How should 6206-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6206-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2Z — two non-contact sheet-metal shields, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-ZZ." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2Z", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6206-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6206-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6206-2RS runs slower and cooler-limited than the open 6206; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6206-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6206-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6206-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6206-RSH exists for arrangements that lubricate through the open side; fitting 6206-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-2RS bearing?", "a": "A 6206-2RS deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6206-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RSH — two contact elastomer seals over a lifetime grease fill, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 7500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-2RS." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2RSH", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6207 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 6207 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-C3. No clearance suffix means normal CN clearance.", "The open 6207 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6207-2Z (shields) and 6207-2RSH (contact seals), not suffix-free 6207.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207 bearing?", "a": "A 6207 deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6207 mean?", "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207 — the open (unsealed) execution, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 13000 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726207-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726207-2RS1 is a standard-inner-ring insert on the same 35x72x17 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6207", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6207-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6207-ZZ.", "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6207-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.", "Shielded 6207-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6207-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6207-2Z (one shield: 6207-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6207-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6207-2Z for high-contamination positions.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-ZZ bearing?", "a": "A 6207-ZZ deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6207 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6207 uses the same ISO 15 envelope (35×72×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6207-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6207-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6207 and verify the residual clearance after mounting." }, { "q": "How should 6207-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6207-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2Z — two non-contact sheet-metal shields, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 10000 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207-ZZ." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2Z", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6207-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6207-2RS runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6207-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6207-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6207-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6207-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6207-RSH exists for arrangements that lubricate through the open side; fitting 6207-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-2RS bearing?", "a": "A 6207-2RS deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6207-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "Are 6207 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6207 uses the same ISO 15 envelope (35×72×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6207-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2RSH — two contact elastomer seals over a lifetime grease fill, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6207-2RS." } ], "cross_ref": [ { "equiv_sku": "6207-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6207-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6207-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6207-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2RS1 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207-2Z shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6207", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6207 shares the 35×72×17 mm envelope but rates differently (27/15.3 kN vs 22.1/15.3 kN) — not a load-rating equivalent." }, { "equiv_sku": "207", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207 shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "207-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 207-2Z shares the 35×72×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2RSH", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6208 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6208 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6208-2Z (shields) and 6208-2RSH (contact seals), not suffix-free 6208.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208 bearing?", "a": "A 6208 deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6208 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6208 need?", "a": "The open 6208 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6208?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208 — the open (unsealed) execution, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 11000 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726208-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726208-2RS1 is a standard-inner-ring insert on the same 40x80x18 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6208", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6208-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6208-ZZ.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6208-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6208-2RS for that.", "Shielded 6208-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6208-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6208-2Z (one shield: 6208-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6208-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6208-2Z for high-contamination positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-ZZ bearing?", "a": "A 6208-ZZ deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6208-ZZ need?", "a": "6208-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6208-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6208-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2Z — two non-contact sheet-metal shields, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-ZZ." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2Z", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6208-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 40 mm shaft for 6208 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6208-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6208-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6208-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6208-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6208-RSH exists for arrangements that lubricate through the open side; fitting 6208-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-2RS bearing?", "a": "A 6208-2RS deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6208-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "Are 6208 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6208 uses the same ISO 15 envelope (40×80×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6208-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RSH — two contact elastomer seals over a lifetime grease fill, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 5600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-2RS." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2RSH", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6209.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6209 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6209 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6209-2Z (shields) and 6209-2RSH (contact seals), not suffix-free 6209.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209 bearing?", "a": "A 6209 deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6209 need?", "a": "The open 6209 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6209 mean?", "a": "A bare 6209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6209?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209 — the open (unsealed) execution, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 11000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726209-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726209B-2RS1/VP274 is a standard-inner-ring insert on the same 45x85x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726209-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726209-2RS1 is a standard-inner-ring insert on the same 45x85x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6209", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6209-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6209-ZZ.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "Do not wash 6209-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6209-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 6209-ZZ and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6209-ZZ.", "SKF spells the shielded version 6209-2Z (one shield: 6209-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6209-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6209-2Z for high-contamination positions.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-ZZ bearing?", "a": "A 6209-ZZ deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6209-ZZ need?", "a": "6209-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6209-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6209-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2Z — two non-contact sheet-metal shields, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.92 kN, limiting speed 8500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209-ZZ." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.92, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6209-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6209-2RS runs slower and cooler-limited than the open 6209; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6209-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6209-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6209-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6209-RSH exists for arrangements that lubricate through the open side; fitting 6209-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-2RS bearing?", "a": "A 6209-2RS deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6209-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2RSH — two contact elastomer seals over a lifetime grease fill, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 5000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6209-2RS." } ], "cross_ref": [ { "equiv_sku": "6209-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6209-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6209-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6209-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2RS1 shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6209-2Z shares the 45×85×19 mm envelope but rates differently (35.1/21.6 kN vs 28.1/20.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "209", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209 shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "209-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 209-2Z shares the 45×85×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6210 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "The open 6210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6210 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6210-2Z (shields) and 6210-2RSH (contact seals), not suffix-free 6210.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210 bearing?", "a": "A 6210 deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6210 mean?", "a": "A bare 6210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210 — the open (unsealed) execution, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 10000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726210-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726210-2RS1 is a standard-inner-ring insert on the same 50x90x20 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6210", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6210-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6210-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6210-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.", "Do not wash 6210-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6210-ZZ.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6210-2Z (one shield: 6210-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6210-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6210-2Z for high-contamination positions.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-ZZ bearing?", "a": "A 6210-ZZ deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6210 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6210 uses the same ISO 15 envelope (50×90×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6210-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6210-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6210 and verify the residual clearance after mounting." }, { "q": "How should 6210-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6210-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2Z — two non-contact sheet-metal shields, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 8000 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210-ZZ." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2Z", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6210-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.", "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6210-2RS runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6210-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6210-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6210-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6210-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6210-RSH exists for arrangements that lubricate through the open side; fitting 6210-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-2RS bearing?", "a": "A 6210-2RS deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6210-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2RSH — two contact elastomer seals over a lifetime grease fill, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4800 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6210-2RS." } ], "cross_ref": [ { "equiv_sku": "6210-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6210-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6210-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6210-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6210 M (machined brass cage, open arrangement) is the same-size execution on the 50×90×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6210-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2RS1 shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6210-2Z shares the 50×90×20 mm envelope but rates differently (37.1/23.2 kN vs 30.2/23.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "210", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210 shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "210-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 210-2Z shares the 50×90×20 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2RSH", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6211 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "The open 6211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6211 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211 drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6211 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6211-2Z (shields) and 6211-2RSH (contact seals), not suffix-free 6211.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211 bearing?", "a": "A 6211 deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6211 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6211 have?", "a": "Unless a clearance suffix says otherwise, 6211 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting." }, { "q": "How should 6211 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6211?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211 — the open (unsealed) execution, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 9000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726211-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726211-2RS1 is a standard-inner-ring insert on the same 55x100x21 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6211", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6211-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6211-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6211-2RS for that.", "Shielded 6211-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6211-2Z (one shield: 6211-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6211-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6211-2Z for high-contamination positions.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-ZZ bearing?", "a": "A 6211-ZZ deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6211-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6211-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting." }, { "q": "How should 6211-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6211-ZZ need?", "a": "6211-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6211-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2Z — two non-contact sheet-metal shields, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211-ZZ." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2Z", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6211-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6211-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6211-2RS runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6211-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6211-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6211-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6211-RSH exists for arrangements that lubricate through the open side; fitting 6211-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-2RS bearing?", "a": "A 6211-2RS deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6211-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "Are 6211 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6211-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2RSH — two contact elastomer seals over a lifetime grease fill, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 4300 r/min, mass 620 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6211-2RS." } ], "cross_ref": [ { "equiv_sku": "6211-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6211-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6211-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6211-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6211 M (machined brass cage, open arrangement) is the same-size execution on the 55×100×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "211", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211 shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "211-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 211-2Z shares the 55×100×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2RSH", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 780, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "The open 6212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6212 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6212 drags the lip and overheats it.", "The open 6212 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6212-2Z (shields) and 6212-2RSH (contact seals), not suffix-free 6212.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212 bearing?", "a": "A 6212 deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6212 mean?", "a": "A bare 6212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "Are 6212 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6212?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212 — the open (unsealed) execution, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 8000 r/min, mass 780 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726212-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726212-2RS1 is a standard-inner-ring insert on the same 60x110x22 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6212", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 810, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6212-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 110 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6212-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6212-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.", "Shielded 6212-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 6212-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6212-2Z (one shield: 6212-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6212-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6212-2Z for high-contamination positions.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-ZZ bearing?", "a": "A 6212-ZZ deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6212-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2Z — two non-contact sheet-metal shields, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 6300 r/min, mass 810 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212-ZZ." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6212-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.", "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6212-2RS runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6212-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6212-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6212-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6212-RSH exists for arrangements that lubricate through the open side; fitting 6212-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-2RS bearing?", "a": "A 6212-2RS deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6212-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "Are 6212 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6212-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2RSH — two contact elastomer seals over a lifetime grease fill, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 4000 r/min, mass 790 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6212-2RS." } ], "cross_ref": [ { "equiv_sku": "6212-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6212-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6212-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6212-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6212 M (machined brass cage, open arrangement) is the same-size execution on the 60×110×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "212", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212 shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "212-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 212-2Z shares the 60×110×22 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6213 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "The open 6213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6213 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6213.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6213 drags the lip and overheats it.", "The open 6213 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6213-2Z (shields) and 6213-2RSH (contact seals), not suffix-free 6213.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213 bearing?", "a": "A 6213 deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "Are 6213 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6213 uses the same ISO 15 envelope (65×120×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6213 have?", "a": "Unless a clearance suffix says otherwise, 6213 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6213 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6213?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213 — the open (unsealed) execution, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 7500 r/min, mass 1000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6213 M (machined brass cage, open arrangement) is the same-size execution on the 65×120×23 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213 shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6213", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6213-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6213-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6213-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.", "Shielded 6213-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 6213-ZZ and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6213-2Z (one shield: 6213-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6213-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6213-2Z for high-contamination positions.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213-ZZ bearing?", "a": "A 6213-ZZ deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6213-ZZ need?", "a": "6213-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6213-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6213-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213-2Z — two non-contact sheet-metal shields, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 6000 r/min, mass 1050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6213-ZZ." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6213-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6213-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6213 M (machined brass cage, open arrangement) is the same-size execution on the 65×120×23 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "213", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213 shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 213-2Z shares the 65×120×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6213-2Z", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6214 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "The open 6214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6214 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6214.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6214.", "The open 6214 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6214-2Z (shields) and 6214-2RSH (contact seals), not suffix-free 6214.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214 bearing?", "a": "A 6214 deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6214 have?", "a": "Unless a clearance suffix says otherwise, 6214 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214 need?", "a": "The open 6214 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6214?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214 — the open (unsealed) execution, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 7000 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6214", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6214-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6214-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Do not wash 6214-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6214-2Z (one shield: 6214-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6214-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6214-2Z for high-contamination positions.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ bearing?", "a": "A 6214-ZZ deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6214-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6214-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-ZZ need?", "a": "6214-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6214-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2Z — two non-contact sheet-metal shields, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 5600 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214-ZZ." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6214-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6214-2RS runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6214-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6214-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6214-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6214-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6214-RS1 exists for arrangements that lubricate through the open side; fitting 6214-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS bearing?", "a": "A 6214-2RS deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6214-2RS have?", "a": "Unless a clearance suffix says otherwise, 6214-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6214 and verify the residual clearance after mounting." }, { "q": "How should 6214-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6214-2RS need?", "a": "6214-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6214 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6214-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3400 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6214-2RS." } ], "cross_ref": [ { "equiv_sku": "6214-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6214-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6214-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6214-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6214 M (machined brass cage, open arrangement) is the same-size execution on the 70×125×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "214", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214 shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "214-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 214-2Z shares the 70×125×24 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6215 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "At 75 mm bore the 62xx light series is the workhorse section; its 130×25 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6215 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6215 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6215-2Z (shields) and 6215-2RSH (contact seals), not suffix-free 6215.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215 bearing?", "a": "A 6215 deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6215 mean?", "a": "A bare 6215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215 — the open (unsealed) execution, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 6700 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6215", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6215-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6215-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Do not wash 6215-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6215-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6215-2Z (one shield: 6215-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6215-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6215-2Z for high-contamination positions.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ bearing?", "a": "A 6215-ZZ deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "Are 6215 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6215 uses the same ISO 15 envelope (75×130×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6215-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6215-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6215 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6215-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2Z — two non-contact sheet-metal shields, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 5300 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215-ZZ." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2Z", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6215-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6215 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6215-2RS runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6215-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6215-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6215-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6215-RS1 exists for arrangements that lubricate through the open side; fitting 6215-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS bearing?", "a": "A 6215-2RS deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6215-2RS need?", "a": "6215-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6215 with a housing grease fitting instead." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6215-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6215-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 3200 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6215-2RS." } ], "cross_ref": [ { "equiv_sku": "6215-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6215-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6215-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6215-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6215 M (machined brass cage, open arrangement) is the same-size execution on the 75×130×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "215", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215 shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "215-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 215-2Z shares the 75×130×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2RS1", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 26 mm-wide ring of 6216 drags the lip and overheats it.", "The open 6216 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6216-2Z (shields) and 6216-2RSH (contact seals), not suffix-free 6216.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216 bearing?", "a": "A 6216 deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6216 mean?", "a": "A bare 6216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216 — the open (unsealed) execution, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 6000 r/min, mass 1450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6216", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6216-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6216-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 80 mm of 6216-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6216-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6216-2RS for that.", "Shielded 6216-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6216-2Z (one shield: 6216-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6216-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6216-2Z for high-contamination positions.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ bearing?", "a": "A 6216-ZZ deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6216-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2Z — two non-contact sheet-metal shields, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 4800 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216-ZZ." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2Z", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6216-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 80 mm of 6216-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6216-2RS runs slower and cooler-limited than the open 6216; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6216-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6216-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 6216-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6216-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6216-RS1 exists for arrangements that lubricate through the open side; fitting 6216-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS bearing?", "a": "A 6216-2RS deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6216-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "Are 6216 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6216-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 3000 r/min, mass 1500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6216-2RS." } ], "cross_ref": [ { "equiv_sku": "6216-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6216-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6216-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6216-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6216 M (machined brass cage, open arrangement) is the same-size execution on the 80×140×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "216", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216 shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "216-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 216-2Z shares the 80×140×26 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2RS1", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6217 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6217 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6217 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6217-2Z (shields) and 6217-2RSH (contact seals), not suffix-free 6217.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217 bearing?", "a": "A 6217 deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6217 have?", "a": "Unless a clearance suffix says otherwise, 6217 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6217 and verify the residual clearance after mounting." }, { "q": "How should 6217 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6217?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217 — the open (unsealed) execution, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6217", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6217-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 85 mm of 6217-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6217-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6217-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6217-2Z (one shield: 6217-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6217-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6217-2Z for high-contamination positions.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ bearing?", "a": "A 6217-ZZ deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6217 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6217-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6217-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6217 and verify the residual clearance after mounting." }, { "q": "How should 6217-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6217-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2Z — two non-contact sheet-metal shields, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 4500 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217-ZZ." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2Z", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6217-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6217-2RS runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6217-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6217-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6217-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6217-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6217-RS1 exists for arrangements that lubricate through the open side; fitting 6217-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS bearing?", "a": "A 6217-2RS deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 2800 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6217-2RS." } ], "cross_ref": [ { "equiv_sku": "6217-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6217-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6217-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6217-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6217 M (machined brass cage, open arrangement) is the same-size execution on the 85×150×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "217", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217 shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "217-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 217-2Z shares the 85×150×28 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2RS1", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6218 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 30 mm-wide ring of 6218 drags the lip and overheats it.", "The open 6218 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6218-2Z (shields) and 6218-2RSH (contact seals), not suffix-free 6218.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218 bearing?", "a": "A 6218 deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6218 have?", "a": "Unless a clearance suffix says otherwise, 6218 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "How should 6218 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6218 need?", "a": "The open 6218 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6218?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218 — the open (unsealed) execution, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 5300 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6218", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6218-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6218-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6218-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6218-2RS for that.", "Do not wash 6218-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6218-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6218-2Z (one shield: 6218-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6218-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6218-2Z for high-contamination positions.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ bearing?", "a": "A 6218-ZZ deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6218-ZZ need?", "a": "6218-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6218-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6218-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2Z — two non-contact sheet-metal shields, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 4300 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218-ZZ." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2Z", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6218-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6218-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6218-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6218-2RS and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6218-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6218-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6218-RS1 exists for arrangements that lubricate through the open side; fitting 6218-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS bearing?", "a": "A 6218-2RS deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "Are 6218 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6218 uses the same ISO 15 envelope (90×160×30 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6218-2RS have?", "a": "Unless a clearance suffix says otherwise, 6218-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6218-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 2600 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6218-2RS." } ], "cross_ref": [ { "equiv_sku": "6218-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6218-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6218-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6218-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6218 M (machined brass cage, open arrangement) is the same-size execution on the 90×160×30 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "218", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218 shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "218-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 218-2Z shares the 90×160×30 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2RS1", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 95 mm of 6219 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "The open 6219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6219 units.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 32 mm-wide ring of 6219 drags the lip and overheats it.", "The open 6219 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6219-2Z (shields) and 6219-2RSH (contact seals), not suffix-free 6219.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219 bearing?", "a": "A 6219 deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6219 mean?", "a": "A bare 6219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219 — the open (unsealed) execution, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6219", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6219-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6219 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6219-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6219-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 170 mm OD should be round within IT7; an oval bore pinches the outer ring of 6219-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6219-2Z (one shield: 6219-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6219-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6219-2Z for high-contamination positions.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ bearing?", "a": "A 6219-ZZ deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "Are 6219 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6219 uses the same ISO 15 envelope (95×170×32 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6219-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6219-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6219-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2Z — two non-contact sheet-metal shields, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 4000 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219-ZZ." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2Z", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6219-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6219-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6219-2RS runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6219-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6219-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6219-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6219-RS1 exists for arrangements that lubricate through the open side; fitting 6219-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS bearing?", "a": "A 6219-2RS deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6219-2RS need?", "a": "6219-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6219 with a housing grease fitting instead." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6219-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 2400 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6219-2RS." } ], "cross_ref": [ { "equiv_sku": "6219-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6219-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6219-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6219-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6219 M (machined brass cage, open arrangement) is the same-size execution on the 95×170×32 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "219", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219 shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "219-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 219-2Z shares the 95×170×32 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2RS1", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 100 mm of 6220 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6220 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6220-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6220 and shows up later as two-point loaded raceway wear.", "The open 6220 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6220-2Z (shields) and 6220-2RSH (contact seals), not suffix-free 6220.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220 bearing?", "a": "A 6220 deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6220 have?", "a": "Unless a clearance suffix says otherwise, 6220 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6220?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220 — the open (unsealed) execution, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 4800 r/min, mass 3200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6220", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6220-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Shielded 6220-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6220-ZZ.", "SKF spells the shielded version 6220-2Z (one shield: 6220-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6220-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6220-2Z for high-contamination positions.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ bearing?", "a": "A 6220-ZZ deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6220-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6220-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting." }, { "q": "How should 6220-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6220-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2Z — two non-contact sheet-metal shields, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 3800 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220-ZZ." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2Z", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6220-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6220-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 100 mm of 6220-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6220-2RS runs slower and cooler-limited than the open 6220; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6220-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6220-2RS and shows up later as two-point loaded raceway wear.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6220-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6220-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6220-RS1 exists for arrangements that lubricate through the open side; fitting 6220-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS bearing?", "a": "A 6220-2RS deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6220-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "Are 6220 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6220-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 2400 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6220-2RS." } ], "cross_ref": [ { "equiv_sku": "6220-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6220-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6220-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6220-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6220 M (machined brass cage, open arrangement) is the same-size execution on the 100×180×34 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "220", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220 shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "220-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 220-2Z shares the 100×180×34 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2RS1", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 105 mm of 6221 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6221 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "The housing bore for the 190 mm OD should be round within IT7; an oval bore pinches the outer ring of 6221 and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 36 mm-wide ring of 6221 drags the lip and overheats it.", "The open 6221 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6221-2Z (shields) and 6221-2RSH (contact seals), not suffix-free 6221.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221 bearing?", "a": "A 6221 deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6221 mean?", "a": "A bare 6221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221 — the open (unsealed) execution, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 4500 r/min, mass 3800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6221-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6221", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6221-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 190 mm outside diameter and 36 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6221-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6221-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 105 mm bore the 62xx light series is the workhorse section; its 190×36 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6221-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6221-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6221-ZZ.", "SKF spells the shielded version 6221-2Z (one shield: 6221-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6221-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6221-2Z for high-contamination positions.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ bearing?", "a": "A 6221-ZZ deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6221-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6221-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting." }, { "q": "How should 6221-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6221-ZZ need?", "a": "6221-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6221-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221-2Z — two non-contact sheet-metal shields, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 3600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6221-ZZ." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6221-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7221", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6221-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6222 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6222 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6222 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6222-2Z (shields) and 6222-2RSH (contact seals), not suffix-free 6222.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222 bearing?", "a": "A 6222 deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6222 have?", "a": "Unless a clearance suffix says otherwise, 6222 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "How should 6222 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6222?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222 — the open (unsealed) execution, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 4300 r/min, mass 4450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6222", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6222-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Shielded 6222-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Never mix components between two 6222-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6222-2Z (one shield: 6222-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6222-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6222-2Z for high-contamination positions.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ bearing?", "a": "A 6222-ZZ deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6222-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6222-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6222-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2Z — two non-contact sheet-metal shields, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 3400 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222-ZZ." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6222-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6222-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 110 mm of 6222-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6222-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6222-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6222-2RS.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6222-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6222-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6222-RS1 exists for arrangements that lubricate through the open side; fitting 6222-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS bearing?", "a": "A 6222-2RS deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6222 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6222-2RS have?", "a": "Unless a clearance suffix says otherwise, 6222-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting." }, { "q": "How should 6222-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6222-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 2000 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6222-2RS." } ], "cross_ref": [ { "equiv_sku": "6222-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6222-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6222-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6222-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7222", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6300 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Miniature bearings like 6300 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "The open 6300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6300 units.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6300 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6300 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6300-2Z (shields) and 6300-2RSH (contact seals), not suffix-free 6300.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300 bearing?", "a": "A 6300 deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6300 mean?", "a": "A bare 6300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6300?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300 — the open (unsealed) execution, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 32000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6300", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 55, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6300-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 6300 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "Do not wash 6300-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6300-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6300-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6300-2Z (one shield: 6300-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6300-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6300-2Z for high-contamination positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-ZZ bearing?", "a": "A 6300-ZZ deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6300-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6300-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2Z — two non-contact sheet-metal shields, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 55 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-ZZ." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2Z", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 54, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6300-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "Heat is the enemy of the sealed 6300-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6300-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 6300-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6300-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6300-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6300-RSH exists for arrangements that lubricate through the open side; fitting 6300-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-2RS bearing?", "a": "A 6300-2RS deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6300-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6300-2RS need?", "a": "6300-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6300 with a housing grease fitting instead." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6300-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSH — two contact elastomer seals over a lifetime grease fill, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 15000 r/min, mass 54 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-2RS." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2RSH", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6201 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6301 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6301 units.", "Never mix components between two 6301 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6301 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6301-2Z (shields) and 6301-2RSH (contact seals), not suffix-free 6301.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301 bearing?", "a": "A 6301 deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6301 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6301 need?", "a": "The open 6301 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6301?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301 — the open (unsealed) execution, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 28000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6301", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 63, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6301-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6201 — do not specify it for speed-critical shafts.", "Do not wash 6301-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6301-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6301-2Z (one shield: 6301-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6301-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6301-2Z for high-contamination positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-ZZ bearing?", "a": "A 6301-ZZ deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6301-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2Z — two non-contact sheet-metal shields, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 63 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-ZZ." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2Z", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 62, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6301-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "Contact seals add drag and heat: 6301-2RS runs slower and cooler-limited than the open 6301; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6301-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6301-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6301-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6301-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6301-RSH exists for arrangements that lubricate through the open side; fitting 6301-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-2RS bearing?", "a": "A 6301-2RS deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6301-2RS need?", "a": "6301-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6301 with a housing grease fitting instead." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6301-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6301-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSH — two contact elastomer seals over a lifetime grease fill, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 14000 r/min, mass 62 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-2RS." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2RSH", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "The open 6302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6302 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6302.", "The open 6302 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6302-2Z (shields) and 6302-2RSH (contact seals), not suffix-free 6302.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302 bearing?", "a": "A 6302 deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6302 mean?", "a": "A bare 6302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6302 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6302 uses the same ISO 15 envelope (15×42×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6302?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302 — the open (unsealed) execution, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 24000 r/min, mass 82 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6302", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 86, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6302-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6302-ZZ (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6202 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6302-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.", "Do not wash 6302-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6302-ZZ and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6302-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6302-2Z (one shield: 6302-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6302-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6302-2Z for high-contamination positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-ZZ bearing?", "a": "A 6302-ZZ deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6302-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6302 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6302 uses the same ISO 15 envelope (15×42×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6302-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2Z — two non-contact sheet-metal shields, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 86 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-ZZ." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6302-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6302-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6202 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6302-2RS runs slower and cooler-limited than the open 6302; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6302-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6302-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6302-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6302-RSH exists for arrangements that lubricate through the open side; fitting 6302-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-2RS bearing?", "a": "A 6302-2RS deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6302-2RS have?", "a": "Unless a clearance suffix says otherwise, 6302-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6302 and verify the residual clearance after mounting." }, { "q": "How should 6302-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6302-2RS need?", "a": "6302-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6302-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSH — two contact elastomer seals over a lifetime grease fill, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 12000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-2RS." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6303 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "The open 6303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6303 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6303 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6303 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6303-2Z (shields) and 6303-2RSH (contact seals), not suffix-free 6303.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303 bearing?", "a": "A 6303 deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6303 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6303 need?", "a": "The open 6303 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6303?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303 — the open (unsealed) execution, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 22000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6303", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6303-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6303-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 6303-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6203 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6303-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6303-2RS for that.", "Shielded 6303-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6303-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6303-ZZ.", "SKF spells the shielded version 6303-2Z (one shield: 6303-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6303-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6303-2Z for high-contamination positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-ZZ bearing?", "a": "A 6303-ZZ deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6303-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6303-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6303 and verify the residual clearance after mounting." }, { "q": "How should 6303-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6303-ZZ need?", "a": "6303-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6303-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2Z — two non-contact sheet-metal shields, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-ZZ." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6303-2Z", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6304 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6304.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6304 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6304 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304.", "The open 6304 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6304-2Z (shields) and 6304-2RSH (contact seals), not suffix-free 6304.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304 bearing?", "a": "A 6304 deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6304 mean?", "a": "A bare 6304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304 — the open (unsealed) execution, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 19000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6304", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6304-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6304-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6304-2RS for that.", "Do not wash 6304-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304-ZZ.", "SKF spells the shielded version 6304-2Z (one shield: 6304-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6304-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6304-2Z for high-contamination positions.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-ZZ bearing?", "a": "A 6304-ZZ deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6304-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6304-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting." }, { "q": "How should 6304-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6304-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2Z — two non-contact sheet-metal shields, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-ZZ." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6304-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6304-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6304-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6304-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed. The single-seal catalogue number is 6304-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6304-RSH exists for arrangements that lubricate through the open side; fitting 6304-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-2RS bearing?", "a": "A 6304-2RS deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6304-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6304-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSH — two contact elastomer seals over a lifetime grease fill, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 9500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-2RS." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (16.8/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2RSH", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Storage matters for open bearings: 6305 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.", "Never mix components between two 6305 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6305 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6305-2Z (shields) and 6305-2RSH (contact seals), not suffix-free 6305.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305 bearing?", "a": "A 6305 deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6305 need?", "a": "The open 6305 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6305 mean?", "a": "A bare 6305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6305?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305 — the open (unsealed) execution, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 16000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726305-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726305-2RS1 is a standard-inner-ring insert on the same 25x62x17 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6305", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6305-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.", "Do not wash 6305-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6305-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6305-ZZ.", "SKF spells the shielded version 6305-2Z (one shield: 6305-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6305-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6305-2Z for high-contamination positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-ZZ bearing?", "a": "A 6305-ZZ deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6305 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6305 uses the same ISO 15 envelope (25×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6305-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6305-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6305 and verify the residual clearance after mounting." }, { "q": "How should 6305-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6305-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2Z — two non-contact sheet-metal shields, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-ZZ." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2Z", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6305-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305-2RS.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Contact seals add drag and heat: 6305-2RS runs slower and cooler-limited than the open 6305; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6305-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6305-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6305-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6305-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6305-RSH exists for arrangements that lubricate through the open side; fitting 6305-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-2RS bearing?", "a": "A 6305-2RS deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6305 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6305 uses the same ISO 15 envelope (25×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6305-2RS have?", "a": "Unless a clearance suffix says otherwise, 6305-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6305 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6305-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RSH — two contact elastomer seals over a lifetime grease fill, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 7500 r/min, mass 240 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-2RS." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2RSH", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6306 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 30 mm shaft for 6306 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "The open 6306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6306 units.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306.", "The open 6306 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6306-2Z (shields) and 6306-2RSH (contact seals), not suffix-free 6306.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306 bearing?", "a": "A 6306 deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6306 need?", "a": "The open 6306 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6306 mean?", "a": "A bare 6306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6306?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306 — the open (unsealed) execution, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 13000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726306-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726306-2RS1 is a standard-inner-ring insert on the same 30x72x19 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6306", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6306-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-ZZ.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6306-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6306-2RS for that.", "Shielded 6306-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6306-2Z (one shield: 6306-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6306-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6306-2Z for high-contamination positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-ZZ bearing?", "a": "A 6306-ZZ deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6306-ZZ need?", "a": "6306-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6306-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6306-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2Z — two non-contact sheet-metal shields, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-ZZ." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6306-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6306-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6306-2RS runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6306-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 19 mm-wide ring of 6306-2RS drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6306-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6306-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6306-RSH exists for arrangements that lubricate through the open side; fitting 6306-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-2RS bearing?", "a": "A 6306-2RS deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6306 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6306 uses the same ISO 15 envelope (30×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6306-2RS have?", "a": "Unless a clearance suffix says otherwise, 6306-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6306 and verify the residual clearance after mounting." }, { "q": "How should 6306-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6306-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RSH — two contact elastomer seals over a lifetime grease fill, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 6300 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-2RS." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2RSH", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6307.", "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6307 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6307 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6307 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6307-2Z (shields) and 6307-2RSH (contact seals), not suffix-free 6307.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307 bearing?", "a": "A 6307 deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6307 have?", "a": "Unless a clearance suffix says otherwise, 6307 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307 — the open (unsealed) execution, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 12000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726307-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726307-2RS1 is a standard-inner-ring insert on the same 35x80x21 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6307", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 480, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6307-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6307-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "ZZ shields are non-contact: 6307-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6307-2RS for that.", "Shielded 6307-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6307-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6307-ZZ.", "SKF spells the shielded version 6307-2Z (one shield: 6307-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6307-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6307-2Z for high-contamination positions.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-ZZ bearing?", "a": "A 6307-ZZ deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6307-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6307-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2Z — two non-contact sheet-metal shields, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 9500 r/min, mass 480 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307-ZZ." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6307-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6307-2RS runs slower and cooler-limited than the open 6307; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6307-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6307-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed. The single-seal catalogue number is 6307-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6307-RSH exists for arrangements that lubricate through the open side; fitting 6307-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-2RS bearing?", "a": "A 6307-2RS deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6307 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6307-2RS have?", "a": "Unless a clearance suffix says otherwise, 6307-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6307-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2RSH — two contact elastomer seals over a lifetime grease fill, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 6000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6307-2RS." } ], "cross_ref": [ { "equiv_sku": "6307-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6307-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6307-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6307-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6307 M (machined brass cage, open arrangement) is the same-size execution on the 35×80×21 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "W6307-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6307-2RS1 shares the 35×80×21 mm envelope but rates differently (35.1/19 kN vs 28.6/19 kN) — not a load-rating equivalent." }, { "equiv_sku": "307", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307 shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "307-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 307-2Z shares the 35×80×21 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6308 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 90 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The open 6308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308 and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308 drags the lip and overheats it.", "The open 6308 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6308-2Z (shields) and 6308-2RSH (contact seals), not suffix-free 6308.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308 bearing?", "a": "A 6308 deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6308 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6308 need?", "a": "The open 6308 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6308?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308 — the open (unsealed) execution, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 11000 r/min, mass 630 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726308-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726308-2RS1 is a standard-inner-ring insert on the same 40x90x23 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6308", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6308-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6308-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6308-2RS for that.", "Shielded 6308-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6308-ZZ.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6308-2Z (one shield: 6308-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6308-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6308-2Z for high-contamination positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-ZZ bearing?", "a": "A 6308-ZZ deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6308-ZZ need?", "a": "6308-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6308-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6308-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2Z — two non-contact sheet-metal shields, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-ZZ." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2Z", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6308-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6308-2RS runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6308-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308-2RS and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6308-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6308-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6308-RSH exists for arrangements that lubricate through the open side; fitting 6308-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-2RS bearing?", "a": "A 6308-2RS deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6308-2RS need?", "a": "6308-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6308 with a housing grease fitting instead." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6308-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6308-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RSH — two contact elastomer seals over a lifetime grease fill, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 5000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-2RS." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2RSH", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 840, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309.", "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.", "The open 6309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6309 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6309.", "The open 6309 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6309-2Z (shields) and 6309-2RSH (contact seals), not suffix-free 6309.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309 bearing?", "a": "A 6309 deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6309 mean?", "a": "A bare 6309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6309 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6309 uses the same ISO 15 envelope (45×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6309?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309 — the open (unsealed) execution, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 9500 r/min, mass 840 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726309-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726309-2RS1 is a standard-inner-ring insert on the same 45x100x25 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726309-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726309B-2RS1/VP274 is a standard-inner-ring insert on the same 45x100x25 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6309", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6309-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309-ZZ.", "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6309-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6309-2RS for that.", "Do not wash 6309-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6309-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6309-2Z (one shield: 6309-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6309-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6309-2Z for high-contamination positions.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-ZZ bearing?", "a": "A 6309-ZZ deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6309-ZZ need?", "a": "6309-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6309-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6309-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2Z — two non-contact sheet-metal shields, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 7500 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309-ZZ." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6309-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 100 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6309-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "Contact seals add drag and heat: 6309-2RS runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6309-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6309-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6309-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6309-RSH exists for arrangements that lubricate through the open side; fitting 6309-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-2RS bearing?", "a": "A 6309-2RS deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6309-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6309 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6309 uses the same ISO 15 envelope (45×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6309-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2RSH — two contact elastomer seals over a lifetime grease fill, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 4500 r/min, mass 850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6309-2RS." } ], "cross_ref": [ { "equiv_sku": "6309-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6309-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6309-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6309-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6309 M (machined brass cage, open arrangement) is the same-size execution on the 45×100×25 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "309", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309 shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "309-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 309-2Z shares the 45×100×25 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "The open 6310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6310 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6310.", "The open 6310 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6310-2Z (shields) and 6310-2RSH (contact seals), not suffix-free 6310.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310 bearing?", "a": "A 6310 deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6310 have?", "a": "Unless a clearance suffix says otherwise, 6310 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting." }, { "q": "How should 6310 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310 need?", "a": "The open 6310 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6310?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310 — the open (unsealed) execution, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 8500 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "1726310-B-2RS1-VP274", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726310B-2RS1/VP274 is a standard-inner-ring insert on the same 50x110x27 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "1726310-2RS1", "equiv_brand": "SKF", "level": "full", "note": "SKF 1726310-2RS1 is a standard-inner-ring insert on the same 50x110x27 mm ISO 15 envelope with ratings within 10 %, but its outer surface is sphered for a Y-housing whereas this page is the cylindrical-OD deep-groove bearing — not interchangeable mounts." }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6310", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6310-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6310 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6310-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.", "Do not wash 6310-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-ZZ.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6310-2Z (one shield: 6310-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6310-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6310-2Z for high-contamination positions.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-ZZ bearing?", "a": "A 6310-ZZ deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6310-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6310-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting." }, { "q": "How should 6310-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310-ZZ need?", "a": "6310-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6310-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2Z — two non-contact sheet-metal shields, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 6700 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310-ZZ." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2Z", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6310-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6310-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6310 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6310-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6310-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-2RS.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6310-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6310-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6310-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6310-RSH exists for arrangements that lubricate through the open side; fitting 6310-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-2RS bearing?", "a": "A 6310-2RS deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6310-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6310-2RS need?", "a": "6310-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6310 with a housing grease fitting instead." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6310-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2RSH — two contact elastomer seals over a lifetime grease fill, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 4300 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6310-2RS." } ], "cross_ref": [ { "equiv_sku": "6310-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6310-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6310-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6310-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6310 M (machined brass cage, open arrangement) is the same-size execution on the 50×110×27 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "310", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310 shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "310-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 310-2Z shares the 50×110×27 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2RSH", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "Storage matters for open bearings: 6311 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.", "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6311 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6311-2Z (shields) and 6311-2RSH (contact seals), not suffix-free 6311.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311 bearing?", "a": "A 6311 deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6311 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6311 need?", "a": "The open 6311 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6311?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311 — the open (unsealed) execution, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8000 r/min, mass 1350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6311", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6311-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6311-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Do not wash 6311-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6311-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6311-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6311-2Z (one shield: 6311-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6311-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6311-2Z for high-contamination positions.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-ZZ bearing?", "a": "A 6311-ZZ deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6311 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6311-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6311-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6311-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2Z — two non-contact sheet-metal shields, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 6300 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311-ZZ." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2Z", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6311-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6311-2RS runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6311-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6311-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6311-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6311-RSH exists for arrangements that lubricate through the open side; fitting 6311-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-2RS bearing?", "a": "A 6311-2RS deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6311 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6311-2RS have?", "a": "Unless a clearance suffix says otherwise, 6311-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6311-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2RSH — two contact elastomer seals over a lifetime grease fill, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3800 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6311-2RS." } ], "cross_ref": [ { "equiv_sku": "6311-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6311-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6311-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6311-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6311-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6311 M (machined brass cage, open arrangement) is the same-size execution on the 55×120×29 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "311", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311 shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "311-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 311-2Z shares the 55×120×29 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2RSH", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6312 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6312 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6312 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6312 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6312 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6312-2Z (shields) and 6312-2RSH (contact seals), not suffix-free 6312.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312 bearing?", "a": "A 6312 deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6312 need?", "a": "The open 6312 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6312 mean?", "a": "A bare 6312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6312?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312 — the open (unsealed) execution, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7000 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6312", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6312-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Do not wash 6312-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6312-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6312-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6312-2Z (one shield: 6312-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6312-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6312-2Z for high-contamination positions.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-ZZ bearing?", "a": "A 6312-ZZ deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6312-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6312-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting." }, { "q": "How should 6312-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6312-ZZ need?", "a": "6312-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6312-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2Z — two non-contact sheet-metal shields, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312-ZZ." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2Z", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6312-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6312-2RS runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6312-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6312-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6312-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6312-RSH exists for arrangements that lubricate through the open side; fitting 6312-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-2RS bearing?", "a": "A 6312-2RS deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6312-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2RSH — two contact elastomer seals over a lifetime grease fill, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6312-2RS." } ], "cross_ref": [ { "equiv_sku": "6312-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6312-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6312-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6312-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6312 M (machined brass cage, open arrangement) is the same-size execution on the 60×130×31 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "312", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312 shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "312-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 312-2Z shares the 60×130×31 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2RSH", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.", "The open 6313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6313 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6313 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6313-2Z (shields) and 6313-2RSH (contact seals), not suffix-free 6313.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313 bearing?", "a": "A 6313 deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6313 mean?", "a": "A bare 6313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313 — the open (unsealed) execution, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 6700 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6313", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6313-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6313-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6313-2RS for that.", "Do not wash 6313-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-ZZ.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6313-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6313-2Z (one shield: 6313-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6313-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6313-2Z for high-contamination positions.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-ZZ bearing?", "a": "A 6313-ZZ deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6313-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6313-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2Z — two non-contact sheet-metal shields, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 5300 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313-ZZ." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2Z", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6313-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6313-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "Heat is the enemy of the sealed 6313-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6313-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6313-2RS.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6313-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6313-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6313-RS1 exists for arrangements that lubricate through the open side; fitting 6313-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-2RS bearing?", "a": "A 6313-2RS deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6313 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6313-2RS have?", "a": "Unless a clearance suffix says otherwise, 6313-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6313 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6313-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 3200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6313-2RS." } ], "cross_ref": [ { "equiv_sku": "6313-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6313-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6313-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6313-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6313 M (machined brass cage, open arrangement) is the same-size execution on the 65×140×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "313", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313 shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "313-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 313-2Z shares the 65×140×33 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2RS1", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6314 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6314 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6314 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6314-2Z (shields) and 6314-2RSH (contact seals), not suffix-free 6314.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314 bearing?", "a": "A 6314 deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6314 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6314 need?", "a": "The open 6314 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6314?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314 — the open (unsealed) execution, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 6300 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6314", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6314-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6314-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6314 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Do not wash 6314-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6314-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6314-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6314-2Z (one shield: 6314-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6314-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6314-2Z for high-contamination positions.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ bearing?", "a": "A 6314-ZZ deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6314-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6314-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6314 and verify the residual clearance after mounting." }, { "q": "How should 6314-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6314-ZZ need?", "a": "6314-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6314-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2Z — two non-contact sheet-metal shields, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314-ZZ." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2Z", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6314-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6314-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6314-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6314-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6314-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6314-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6314-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6314-RS1 exists for arrangements that lubricate through the open side; fitting 6314-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS bearing?", "a": "A 6314-2RS deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6314 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6314 uses the same ISO 15 envelope (70×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6314-2RS have?", "a": "Unless a clearance suffix says otherwise, 6314-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6314 and verify the residual clearance after mounting." }, { "q": "How should 6314-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6314-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 3000 r/min, mass 2600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6314-2RS." } ], "cross_ref": [ { "equiv_sku": "6314-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6314-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6314-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6314-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6314 M (machined brass cage, open arrangement) is the same-size execution on the 70×150×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "314", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314 shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "314-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 314-2Z shares the 70×150×35 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2RS1", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6315 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "The open 6315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6315 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6315 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6315-2Z (shields) and 6315-2RSH (contact seals), not suffix-free 6315.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315 bearing?", "a": "A 6315 deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6315 have?", "a": "Unless a clearance suffix says otherwise, 6315 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6315 need?", "a": "The open 6315 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6315?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315 — the open (unsealed) execution, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 5600 r/min, mass 3050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6315", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6315-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6315 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "ZZ shields are non-contact: 6315-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Shielded 6315-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6315-2Z (one shield: 6315-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6315-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6315-2Z for high-contamination positions.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ bearing?", "a": "A 6315-ZZ deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6315-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6315-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting." }, { "q": "How should 6315-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6315-ZZ need?", "a": "6315-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6315-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2Z — two non-contact sheet-metal shields, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 4500 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315-ZZ." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2Z", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6315-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "Contact seals add drag and heat: 6315-2RS runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6315-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-2RS drags the lip and overheats it.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6315-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6315-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6315-RS1 exists for arrangements that lubricate through the open side; fitting 6315-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS bearing?", "a": "A 6315-2RS deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6315-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6315 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6315-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 2800 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6315-2RS." } ], "cross_ref": [ { "equiv_sku": "6315-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6315-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6315-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6315-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6315 M (machined brass cage, open arrangement) is the same-size execution on the 75×160×37 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "315", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315 shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "315-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 315-2Z shares the 75×160×37 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2RS1", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6316 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "The open 6316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6316 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6316-2Z (shields) and 6316-2RSH (contact seals), not suffix-free 6316.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316 bearing?", "a": "A 6316 deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6316 have?", "a": "Unless a clearance suffix says otherwise, 6316 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6316 and verify the residual clearance after mounting." }, { "q": "How should 6316 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316 need?", "a": "The open 6316 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6316?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316 — the open (unsealed) execution, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 5300 r/min, mass 3650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6316", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6316-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6316-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6316-2RS for that.", "Do not wash 6316-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6316-ZZ.", "SKF spells the shielded version 6316-2Z (one shield: 6316-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6316-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6316-2Z for high-contamination positions.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ bearing?", "a": "A 6316-ZZ deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6316-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316-ZZ need?", "a": "6316-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6316-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2Z — two non-contact sheet-metal shields, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 4300 r/min, mass 3750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316-ZZ." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2Z", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6316-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6316-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6316-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6316-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6316-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6316-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6316-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6316-RS1 exists for arrangements that lubricate through the open side; fitting 6316-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS bearing?", "a": "A 6316-2RS deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6316-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6316-2RS need?", "a": "6316-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6316 with a housing grease fitting instead." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6316-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 2600 r/min, mass 3700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6316-2RS." } ], "cross_ref": [ { "equiv_sku": "6316-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6316-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6316-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6316-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6316 M (machined brass cage, open arrangement) is the same-size execution on the 80×170×39 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "316", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316 shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "316-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 316-2Z shares the 80×170×39 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2RS1", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6317 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 6317 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The open 6317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6317 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.", "The open 6317 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6317-2Z (shields) and 6317-2RSH (contact seals), not suffix-free 6317.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317 bearing?", "a": "A 6317 deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6317 mean?", "a": "A bare 6317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6317?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317 — the open (unsealed) execution, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 5000 r/min, mass 4250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6317", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6317-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 85 mm of 6317-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Do not wash 6317-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6317-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6317-2Z (one shield: 6317-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6317-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6317-2Z for high-contamination positions.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ bearing?", "a": "A 6317-ZZ deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6317-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6317-ZZ need?", "a": "6317-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6317-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2Z — two non-contact sheet-metal shields, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 4000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317-ZZ." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6317-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 85 mm of 6317-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Heat is the enemy of the sealed 6317-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6317-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 180 mm OD should be round within IT7; an oval bore pinches the outer ring of 6317-2RS and shows up later as two-point loaded raceway wear.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6317-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6317-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6317-RS1 exists for arrangements that lubricate through the open side; fitting 6317-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS bearing?", "a": "A 6317-2RS deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6317 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6317-2RS have?", "a": "Unless a clearance suffix says otherwise, 6317-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6317 and verify the residual clearance after mounting." }, { "q": "How should 6317-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6317-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 2400 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6317-2RS." } ], "cross_ref": [ { "equiv_sku": "6317-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6317-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6317-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6317-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6317 M (machined brass cage, open arrangement) is the same-size execution on the 85×180×41 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "317", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317 shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "317-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2RS1", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6318 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 43 mm-wide ring of 6318 drags the lip and overheats it.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6318 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6318-2Z (shields) and 6318-2RSH (contact seals), not suffix-free 6318.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318 bearing?", "a": "A 6318 deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6318 have?", "a": "Unless a clearance suffix says otherwise, 6318 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting." }, { "q": "How should 6318 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6318 need?", "a": "The open 6318 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6318?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318 — the open (unsealed) execution, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 4800 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6318", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6318-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6318-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 90 mm of 6318-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "ZZ shields are non-contact: 6318-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Do not wash 6318-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6318-2Z (one shield: 6318-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6318-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6318-2Z for high-contamination positions.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ bearing?", "a": "A 6318-ZZ deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6318 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6318 uses the same ISO 15 envelope (90×190×43 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6318-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2Z — two non-contact sheet-metal shields, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 3800 r/min, mass 5150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318-ZZ." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6318-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6318-2RS runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6318-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-2RS.", "Shaft and housing fillets must clear the bearing chamfer so the 43 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6318-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6318-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6318-RS1 exists for arrangements that lubricate through the open side; fitting 6318-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS bearing?", "a": "A 6318-2RS deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6318-2RS need?", "a": "6318-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6318 with a housing grease fitting instead." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6318-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6318-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 2400 r/min, mass 5100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6318-2RS." } ], "cross_ref": [ { "equiv_sku": "6318-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6318-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6318-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6318-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6318 M (machined brass cage, open arrangement) is the same-size execution on the 90×190×43 mm envelope with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "318", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318 shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "318-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 318-2Z shares the 90×190×43 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 95 mm of 6319 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6319 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6319 units.", "Never mix components between two 6319 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-C3. No clearance suffix means normal CN clearance.", "The open 6319 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6319-2Z (shields) and 6319-2RSH (contact seals), not suffix-free 6319.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319 bearing?", "a": "A 6319 deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6319 have?", "a": "Unless a clearance suffix says otherwise, 6319 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6319 and verify the residual clearance after mounting." }, { "q": "How should 6319 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6319 need?", "a": "The open 6319 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6319?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319 — the open (unsealed) execution, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 4500 r/min, mass 5750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6319", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6319-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.", "ZZ shields are non-contact: 6319-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6319-2RS for that.", "Do not wash 6319-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6319-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6319-2Z (one shield: 6319-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6319-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6319-2Z for high-contamination positions.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ bearing?", "a": "A 6319-ZZ deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6319 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6319 uses the same ISO 15 envelope (95×200×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6319-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6319-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6319 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6319-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2Z — two non-contact sheet-metal shields, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319-ZZ." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2Z", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6319-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6319-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 95 mm of 6319-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Contact seals add drag and heat: 6319-2RS runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6319-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6319-2RS.", "SKF catalogues the contact-sealed version as 6319-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6319-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6319-RS1 exists for arrangements that lubricate through the open side; fitting 6319-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS bearing?", "a": "A 6319-2RS deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6319-2RS need?", "a": "6319-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6319 with a housing grease fitting instead." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6319-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6319-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 2200 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6319-2RS." } ], "cross_ref": [ { "equiv_sku": "6319-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6319-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6319-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6319-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6319 M (machined brass cage, open arrangement) is the same-size execution on the 95×200×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2RS1", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2200, "max_rpm": 2200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6320-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6320-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 100 mm of 6320-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "ZZ shields are non-contact: 6320-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6320-2RS for that.", "Do not wash 6320-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6320-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6320-2Z (one shield: 6320-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6320-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6320-2Z for high-contamination positions.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ bearing?", "a": "A 6320-ZZ deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6320-ZZ need?", "a": "6320-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6320-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6320-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2Z — two non-contact sheet-metal shields, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 3400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6320-ZZ." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6320 M (machined brass cage, open arrangement) is the same-size execution on the 100×215×47 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2Z", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6320-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6320-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 100 mm bore gains dynamic rating through larger rolling elements on a 215 mm OD; the penalty is mass and a lower limiting speed than the 6220 — do not specify it for speed-critical shafts.", "Contact seals add drag and heat: 6320-2RS runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6320-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6320-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6320-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6320-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6320-RS1 exists for arrangements that lubricate through the open side; fitting 6320-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS bearing?", "a": "A 6320-2RS deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6320 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6320-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 2000 r/min, mass 7200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6320-2RS." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6320-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6320-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6320-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6320 M (machined brass cage, open arrangement) is the same-size execution on the 100×215×47 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2RS1", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6321 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Storage matters for open bearings: 6321 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6321.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6321 and shows up later as two-point loaded raceway wear.", "The open 6321 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6321-2Z (shields) and 6321-2RSH (contact seals), not suffix-free 6321.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321 bearing?", "a": "A 6321 deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6321 need?", "a": "The open 6321 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6321 mean?", "a": "A bare 6321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6321?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321 — the open (unsealed) execution, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 4000 r/min, mass 8200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6321-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6321-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "7321", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6321", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6321-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6321-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Do not wash 6321-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6321-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6321-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6321-2Z (one shield: 6321-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6321-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6321-2Z for high-contamination positions.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ bearing?", "a": "A 6321-ZZ deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6321-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6321 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6321 uses the same ISO 15 envelope (105×225×49 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6321-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321-2Z — two non-contact sheet-metal shields, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 3200 r/min, mass 8250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6321-ZZ." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6321-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6321-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6321-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6321-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "7321", "equiv_brand": "SKF", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6321-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6321-2Z", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6322", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.", "The open 6322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6322 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6322 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6322-2Z (shields) and 6322-2RSH (contact seals), not suffix-free 6322.", "The 203/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6322 bearing?", "a": "A 6322 deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6322 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6322 uses the same ISO 15 envelope (110×240×50 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6322 have?", "a": "Unless a clearance suffix says otherwise, 6322 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6322 and verify the residual clearance after mounting." }, { "q": "How should 6322 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6322?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6322 — the open (unsealed) execution, 110×240×50 mm per ISO 15. Quoted values: C 203 kN, C0 180 kN, Pu 5.7 kN, limiting speed 3800 r/min, mass 9650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6322." } ], "cross_ref": [ { "equiv_sku": "6322-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6322-RSR", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6322-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "7322", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "6322-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6322 M (machined brass cage, open arrangement) is the same-size execution on the 110×240×50 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6322", "material": "GCr15", "dynamic_load_kN": 203, "static_load_kN": 180, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6004 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6004 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6004-2Z (shields) and 6004-2RSH (contact seals), not suffix-free 6004.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004 bearing?", "a": "A 6004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6004 mean?", "a": "A bare 6004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004 — the open (unsealed) execution, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 24000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6004", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 71, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6004-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6004-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-ZZ.", "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.", "ZZ shields are non-contact: 6004-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.", "Shielded 6004-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6004-2Z (one shield: 6004-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6004-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6004-2Z for high-contamination positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-ZZ bearing?", "a": "A 6004-ZZ deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6004-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6004-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting." }, { "q": "How should 6004-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6004-ZZ need?", "a": "6004-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6004-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2Z — two non-contact sheet-metal shields, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 71 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-ZZ." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6004-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 20 mm shaft for 6004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6004-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6004-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 6004-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 6004-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6004-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6004-RSH exists for arrangements that lubricate through the open side; fitting 6004-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-2RS bearing?", "a": "A 6004-2RS deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6004-2RS need?", "a": "6004-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6004 with a housing grease fitting instead." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6004-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6004-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSH — two contact elastomer seals over a lifetime grease fill, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 11000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-2RS." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 78, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Storage matters for open bearings: 6005 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6005-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6005.", "The open 6005 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6005-2Z (shields) and 6005-2RSH (contact seals), not suffix-free 6005.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005 bearing?", "a": "A 6005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6005 need?", "a": "The open 6005 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6005 mean?", "a": "A bare 6005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6005?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005 — the open (unsealed) execution, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 20000 r/min, mass 78 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6005", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6005-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6005-ZZ.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Do not wash 6005-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6005-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6005-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6005-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6005-2Z (one shield: 6005-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6005-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6005-2Z for high-contamination positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-ZZ bearing?", "a": "A 6005-ZZ deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6005 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6005 uses the same ISO 15 envelope (25×47×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6005-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6005-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6005-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2Z — two non-contact sheet-metal shields, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-ZZ." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6005-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6005-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 25 mm shaft for 6005 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.", "Contact seals add drag and heat: 6005-2RS runs slower and cooler-limited than the open 6005; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6005-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6005-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6005-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6005-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6005-RSH exists for arrangements that lubricate through the open side; fitting 6005-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-2RS bearing?", "a": "A 6005-2RS deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6005-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6005 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6005 uses the same ISO 15 envelope (25×47×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6005-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSH — two contact elastomer seals over a lifetime grease fill, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 9500 r/min, mass 81 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-2RS." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6006-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6006-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.", "Do not wash 6006-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6006-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-ZZ.", "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 6006-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6006-2Z (one shield: 6006-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6006-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6006-2Z for high-contamination positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-ZZ bearing?", "a": "A 6006-ZZ deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6006 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6006 uses the same ISO 15 envelope (30×55×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6006-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6006-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6006 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6006-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2Z — two non-contact sheet-metal shields, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-ZZ." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2Z", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6006-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6006-2RS runs slower and cooler-limited than the open 6006; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6006-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6006-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6006-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6006-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6006-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6006-RS1 exists for arrangements that lubricate through the open side; fitting 6006-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-2RS bearing?", "a": "A 6006-2RS deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6006-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 8000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-2RS." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "The open 6007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6007 units.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6007 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6007.", "The open 6007 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6007-2Z (shields) and 6007-2RSH (contact seals), not suffix-free 6007.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007 bearing?", "a": "A 6007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6007 mean?", "a": "A bare 6007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007 — the open (unsealed) execution, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6007", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6007-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007-ZZ.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "ZZ shields are non-contact: 6007-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6007-2RS for that.", "Shielded 6007-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6007-ZZ.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 6007-2Z (one shield: 6007-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6007-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6007-2Z for high-contamination positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-ZZ bearing?", "a": "A 6007-ZZ deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6007-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6007-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6007 and verify the residual clearance after mounting." }, { "q": "How should 6007-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-ZZ need?", "a": "6007-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6007-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2Z — two non-contact sheet-metal shields, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-ZZ." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6007-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6007-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.", "Contact seals add drag and heat: 6007-2RS runs slower and cooler-limited than the open 6007; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6007-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6007-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6007-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6007-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6007-RS1 exists for arrangements that lubricate through the open side; fitting 6007-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-2RS bearing?", "a": "A 6007-2RS deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6007-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-2RS need?", "a": "6007-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6007-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 7000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-2RS." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2RS1", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "The open 6008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6008 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The housing bore for the 68 mm OD should be round within IT7; an oval bore pinches the outer ring of 6008 and shows up later as two-point loaded raceway wear.", "The open 6008 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6008-2Z (shields) and 6008-2RSH (contact seals), not suffix-free 6008.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008 bearing?", "a": "A 6008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6008 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6008 uses the same ISO 15 envelope (40×68×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6008 have?", "a": "Unless a clearance suffix says otherwise, 6008 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6008 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6008?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008 — the open (unsealed) execution, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 14000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6008", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6008-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6008-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6008-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6008-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6008-2Z (one shield: 6008-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6008-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6008-2Z for high-contamination positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-ZZ bearing?", "a": "A 6008-ZZ deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6008-ZZ need?", "a": "6008-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6008-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6008-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2Z — two non-contact sheet-metal shields, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-ZZ." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2Z", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6008-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 40 mm shaft for 6008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "Contact seals add drag and heat: 6008-2RS runs slower and cooler-limited than the open 6008; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6008-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6008-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed. The single-seal catalogue number is 6008-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6008-RS1 exists for arrangements that lubricate through the open side; fitting 6008-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-2RS bearing?", "a": "A 6008-2RS deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6008-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 6300 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-2RS." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2RS1", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.", "Storage matters for open bearings: 6009 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.", "The housing bore for the 75 mm OD should be round within IT7; an oval bore pinches the outer ring of 6009 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6009 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6009-2Z (shields) and 6009-2RSH (contact seals), not suffix-free 6009.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009 bearing?", "a": "A 6009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6009 need?", "a": "The open 6009 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6009 mean?", "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6009?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009 — the open (unsealed) execution, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 12000 r/min, mass 240 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6009", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6009-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6009-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.", "Do not wash 6009-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6009-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6009-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6009-2Z (one shield: 6009-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6009-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6009-2Z for high-contamination positions.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-ZZ bearing?", "a": "A 6009-ZZ deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6009-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6009 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6009 uses the same ISO 15 envelope (45×75×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6009-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2Z — two non-contact sheet-metal shields, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 10000 r/min, mass 250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009-ZZ." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2Z", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6009-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6009-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6009-2RS runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6009-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 6009-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6009-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6009-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6009-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6009-RS1 exists for arrangements that lubricate through the open side; fitting 6009-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-2RS bearing?", "a": "A 6009-2RS deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6009 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6009 uses the same ISO 15 envelope (45×75×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6009-2RS have?", "a": "Unless a clearance suffix says otherwise, 6009-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6009 and verify the residual clearance after mounting." }, { "q": "How should 6009-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6009-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 5600 r/min, mass 250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6009-2RS." } ], "cross_ref": [ { "equiv_sku": "6009-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6009-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6009-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6009-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6009-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2RS1 shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6009-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6009-2Z shares the 45×75×16 mm envelope but rates differently (22.1/14.6 kN vs 18.2/15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2RS1", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6010 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6010 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6010-2Z (shields) and 6010-2RSH (contact seals), not suffix-free 6010.", "The 22.9/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010 bearing?", "a": "A 6010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6010 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6010 uses the same ISO 15 envelope (50×80×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6010 have?", "a": "Unless a clearance suffix says otherwise, 6010 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6010?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010 — the open (unsealed) execution, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 16 kN, Pu 0.71 kN, limiting speed 11000 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/16 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/16 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6010", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 16, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6010-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6010-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6010-2RS for that.", "Do not wash 6010-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6010-2Z (one shield: 6010-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6010-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6010-2Z for high-contamination positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-ZZ bearing?", "a": "A 6010-ZZ deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6010-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6010-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting." }, { "q": "How should 6010-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6010-ZZ need?", "a": "6010-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6010-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2Z — two non-contact sheet-metal shields, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-ZZ." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2Z", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6010-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "Contact seals add drag and heat: 6010-2RS runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6010-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6010-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6010-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6010-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6010-RS1 exists for arrangements that lubricate through the open side; fitting 6010-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-2RS bearing?", "a": "A 6010-2RS deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6010-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 5000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-2RS." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2RS1", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6011 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6011 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6011.", "The open 6011 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6011-2Z (shields) and 6011-2RSH (contact seals), not suffix-free 6011.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011 bearing?", "a": "A 6011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6011 have?", "a": "Unless a clearance suffix says otherwise, 6011 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6011 and verify the residual clearance after mounting." }, { "q": "How should 6011 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6011 need?", "a": "The open 6011 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6011?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011 — the open (unsealed) execution, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 10000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6011", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6011-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.", "Do not wash 6011-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6011-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6011-ZZ.", "SKF spells the shielded version 6011-2Z (one shield: 6011-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6011-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6011-2Z for high-contamination positions.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-ZZ bearing?", "a": "A 6011-ZZ deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6011-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2Z — two non-contact sheet-metal shields, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 8000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011-ZZ." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6011-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6011-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.", "Contact seals add drag and heat: 6011-2RS runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6011-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6011-2RS drags the lip and overheats it.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6011-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed. The single-seal catalogue number is 6011-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6011-RS1 exists for arrangements that lubricate through the open side; fitting 6011-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-2RS bearing?", "a": "A 6011-2RS deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6011-2RS need?", "a": "6011-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6011 with a housing grease fitting instead." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6011-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6011-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4500 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6011-2RS." } ], "cross_ref": [ { "equiv_sku": "6011-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6011-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6011-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6011-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6011-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6011 M (machined brass cage, open arrangement) is the same-size execution on the 55×90×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2RS1", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "The open 6012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6012 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6012 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6012-2Z (shields) and 6012-2RSH (contact seals), not suffix-free 6012.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012 bearing?", "a": "A 6012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6012 have?", "a": "Unless a clearance suffix says otherwise, 6012 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "How should 6012 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6012 need?", "a": "The open 6012 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6012?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012 — the open (unsealed) execution, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 9500 r/min, mass 410 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6012", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6012-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6012-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "ZZ shields are non-contact: 6012-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.", "Do not wash 6012-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-ZZ drags the lip and overheats it.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6012-2Z (one shield: 6012-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6012-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6012-2Z for high-contamination positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-ZZ bearing?", "a": "A 6012-ZZ deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6012-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6012 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6012-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2Z — two non-contact sheet-metal shields, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-ZZ." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2Z", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6012-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6012 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6012-2RS runs slower and cooler-limited than the open 6012; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6012-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6012-2RS.", "SKF catalogues the contact-sealed version as 6012-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6012-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6012-RS1 exists for arrangements that lubricate through the open side; fitting 6012-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-2RS bearing?", "a": "A 6012-2RS deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6012-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6012-2RS need?", "a": "6012-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6012 with a housing grease fitting instead." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6012-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4300 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-2RS." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2RS1", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 440, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6013 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6013 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6013 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6013-2Z (shields) and 6013-2RSH (contact seals), not suffix-free 6013.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013 bearing?", "a": "A 6013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6013 have?", "a": "Unless a clearance suffix says otherwise, 6013 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting." }, { "q": "How should 6013 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013 need?", "a": "The open 6013 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6013?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013 — the open (unsealed) execution, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 9000 r/min, mass 440 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6013", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6013-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6013 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.", "ZZ shields are non-contact: 6013-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.", "Do not wash 6013-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6013-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6013-2Z (one shield: 6013-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6013-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6013-2Z for high-contamination positions.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-ZZ bearing?", "a": "A 6013-ZZ deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6013-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6013-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting." }, { "q": "How should 6013-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013-ZZ need?", "a": "6013-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6013-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2Z — two non-contact sheet-metal shields, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 7000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013-ZZ." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2Z", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6013-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6013-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.", "Contact seals add drag and heat: 6013-2RS runs slower and cooler-limited than the open 6013; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6013-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6013-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6013-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6013-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6013-RS1 exists for arrangements that lubricate through the open side; fitting 6013-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-2RS bearing?", "a": "A 6013-2RS deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6013-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6013-2RS need?", "a": "6013-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6013 with a housing grease fitting instead." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6013-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 4000 r/min, mass 450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6013-2RS." } ], "cross_ref": [ { "equiv_sku": "6013-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6013-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6013-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6013-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6013-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6013 M (machined brass cage, open arrangement) is the same-size execution on the 65×100×18 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2RS1", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6014 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "The open 6014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6014.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 6014 and shows up later as two-point loaded raceway wear.", "The open 6014 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6014-2Z (shields) and 6014-2RSH (contact seals), not suffix-free 6014.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014 bearing?", "a": "A 6014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6014 need?", "a": "The open 6014 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6014 mean?", "a": "A bare 6014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6014?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014 — the open (unsealed) execution, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 8000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6014", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6014-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6014-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6014-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6014-2RS for that.", "Do not wash 6014-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6014-2Z (one shield: 6014-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6014-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6014-2Z for high-contamination positions.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ bearing?", "a": "A 6014-ZZ deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6014 uses the same ISO 15 envelope (70×110×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6014-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6014-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "How should 6014-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6014-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2Z — two non-contact sheet-metal shields, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 6300 r/min, mass 640 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014-ZZ." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2Z", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6014-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6014 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.", "Heat is the enemy of the sealed 6014-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6014-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6014-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6014-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6014-RS1 exists for arrangements that lubricate through the open side; fitting 6014-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS bearing?", "a": "A 6014-2RS deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6014 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6014 uses the same ISO 15 envelope (70×110×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6014-2RS have?", "a": "Unless a clearance suffix says otherwise, 6014-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6014 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6014-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 3600 r/min, mass 630 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6014-2RS." } ], "cross_ref": [ { "equiv_sku": "6014-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6014-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6014-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6014-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6014-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6014 M (machined brass cage, open arrangement) is the same-size execution on the 70×110×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2RS1", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6015 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "The open 6015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6015 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6015-2Z (shields) and 6015-2RSH (contact seals), not suffix-free 6015.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015 bearing?", "a": "A 6015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6015 have?", "a": "Unless a clearance suffix says otherwise, 6015 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "How should 6015 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6015 need?", "a": "The open 6015 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6015?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015 — the open (unsealed) execution, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 7500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6015", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6015-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "ZZ shields are non-contact: 6015-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6015-2RS for that.", "Do not wash 6015-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6015-ZZ.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6015-2Z (one shield: 6015-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6015-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6015-2Z for high-contamination positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ bearing?", "a": "A 6015-ZZ deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6015-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6015-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2Z — two non-contact sheet-metal shields, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 680 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-ZZ." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2Z", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6015-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Contact seals add drag and heat: 6015-2RS runs slower and cooler-limited than the open 6015; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6015-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6015-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 6015-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6015-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6015-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6015-RS1 exists for arrangements that lubricate through the open side; fitting 6015-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS bearing?", "a": "A 6015-2RS deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6015-2RS have?", "a": "Unless a clearance suffix says otherwise, 6015-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6015 and verify the residual clearance after mounting." }, { "q": "How should 6015-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6015-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 3400 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-2RS." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2RS1", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6016 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "Storage matters for open bearings: 6016 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016.", "The open 6016 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6016-2Z (shields) and 6016-2RSH (contact seals), not suffix-free 6016.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016 bearing?", "a": "A 6016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6016 have?", "a": "Unless a clearance suffix says otherwise, 6016 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016 — the open (unsealed) execution, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 7000 r/min, mass 860 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6016", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6016-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.", "ZZ shields are non-contact: 6016-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Do not wash 6016-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-ZZ.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6016-2Z (one shield: 6016-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6016-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6016-2Z for high-contamination positions.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ bearing?", "a": "A 6016-ZZ deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6016-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2Z — two non-contact sheet-metal shields, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 890 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016-ZZ." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2Z", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6016-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6016-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6016-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 80 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6016-2RS.", "The housing bore for the 125 mm OD should be round within IT7; an oval bore pinches the outer ring of 6016-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6016-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6016-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6016-RS1 exists for arrangements that lubricate through the open side; fitting 6016-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS bearing?", "a": "A 6016-2RS deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6016 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6016-2RS have?", "a": "Unless a clearance suffix says otherwise, 6016-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6016 and verify the residual clearance after mounting." }, { "q": "How should 6016-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6016-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 3200 r/min, mass 880 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6016-2RS." } ], "cross_ref": [ { "equiv_sku": "6016-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6016-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6016-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6016-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2RS1", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 85 mm of 6017 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6017 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6017 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6017-C3. No clearance suffix means normal CN clearance.", "The open 6017 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6017-2Z (shields) and 6017-2RSH (contact seals), not suffix-free 6017.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017 bearing?", "a": "A 6017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6017 uses the same ISO 15 envelope (85×130×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6017 have?", "a": "Unless a clearance suffix says otherwise, 6017 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6017 and verify the residual clearance after mounting." }, { "q": "How should 6017 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6017?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017 — the open (unsealed) execution, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 6700 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6017", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6017-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 6017-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6017-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6017-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6017-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6017-2Z (one shield: 6017-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6017-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6017-2Z for high-contamination positions.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-ZZ bearing?", "a": "A 6017-ZZ deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6017-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6017-ZZ need?", "a": "6017-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6017-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2Z — two non-contact sheet-metal shields, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 5300 r/min, mass 940 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017-ZZ." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2Z", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6017-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6017-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6017-2RS runs slower and cooler-limited than the open 6017; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6017-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6017-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6017-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6017-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6017-RS1 exists for arrangements that lubricate through the open side; fitting 6017-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-2RS bearing?", "a": "A 6017-2RS deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6017 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6017 uses the same ISO 15 envelope (85×130×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6017-2RS have?", "a": "Unless a clearance suffix says otherwise, 6017-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6017 and verify the residual clearance after mounting." }, { "q": "How should 6017-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6017-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 3000 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6017-2RS." } ], "cross_ref": [ { "equiv_sku": "6017-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6017-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6017-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2RS1", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6018 units.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6018 and shows up later as two-point loaded raceway wear.", "Never mix components between two 6018 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6018 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6018-2Z (shields) and 6018-2RSH (contact seals), not suffix-free 6018.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018 bearing?", "a": "A 6018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6018 need?", "a": "The open 6018 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6018 mean?", "a": "A bare 6018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6018?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018 — the open (unsealed) execution, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 6300 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6018", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6018-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6018-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 90 mm of 6018-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 90 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6218 before committing to the smaller envelope.", "Do not wash 6018-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6018-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6018-ZZ and shows up later as two-point loaded raceway wear.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6018-2Z (one shield: 6018-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6018-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6018-2Z for high-contamination positions.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-ZZ bearing?", "a": "A 6018-ZZ deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6018-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6018-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting." }, { "q": "How should 6018-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6018-ZZ need?", "a": "6018-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6018-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2Z — two non-contact sheet-metal shields, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018-ZZ." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2Z", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6018-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6018-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 90 mm of 6018-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 90 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6218 before committing to the smaller envelope.", "Contact seals add drag and heat: 6018-2RS runs slower and cooler-limited than the open 6018; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6018-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6018-2RS drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 90 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6018-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6018-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6018-RS1 exists for arrangements that lubricate through the open side; fitting 6018-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-2RS bearing?", "a": "A 6018-2RS deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6018 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6018 uses the same ISO 15 envelope (90×140×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6018-2RS have?", "a": "Unless a clearance suffix says otherwise, 6018-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting." }, { "q": "How should 6018-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6018-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 2800 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6018-2RS." } ], "cross_ref": [ { "equiv_sku": "6018-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6018-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6018-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6018-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6018 M (machined brass cage, open arrangement) is the same-size execution on the 90×140×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2RS1", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 6019 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.", "The open 6019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6019 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6019.", "The open 6019 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6019-2Z (shields) and 6019-2RSH (contact seals), not suffix-free 6019.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019 bearing?", "a": "A 6019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6019 mean?", "a": "A bare 6019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6019 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6019?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019 — the open (unsealed) execution, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 6000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6019", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6019-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6019-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.", "ZZ shields are non-contact: 6019-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6019-2RS for that.", "Shielded 6019-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6019-2Z (one shield: 6019-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6019-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6019-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-ZZ bearing?", "a": "A 6019-ZZ deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6019 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6019-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6019-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting." }, { "q": "How should 6019-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6019-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2Z — two non-contact sheet-metal shields, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 4800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019-ZZ." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6019-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6019-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6019-2RS runs slower and cooler-limited than the open 6019; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6019-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6019-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 6019-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-2RS bearing?", "a": "A 6019-2RS deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6019-2RS have?", "a": "Unless a clearance suffix says otherwise, 6019-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting." }, { "q": "How should 6019-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6019-2RS need?", "a": "6019-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6019 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6019-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 2800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6019-2RS." } ], "cross_ref": [ { "equiv_sku": "6019-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6019-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6019-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6020 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-C3. No clearance suffix means normal CN clearance.", "The open 6020 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6020-2Z (shields) and 6020-2RSH (contact seals), not suffix-free 6020.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020 bearing?", "a": "A 6020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6020 have?", "a": "Unless a clearance suffix says otherwise, 6020 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6020?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020 — the open (unsealed) execution, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 5600 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6020", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6020-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 150 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6020-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.", "Do not wash 6020-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6020-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6020-2Z (one shield: 6020-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6020-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6020-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-ZZ bearing?", "a": "A 6020-ZZ deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6020-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6020-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6020-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2Z — two non-contact sheet-metal shields, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 4500 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020-ZZ." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6020-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6020-2RS runs slower and cooler-limited than the open 6020; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6020-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 6020-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6020-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6020-RS1 exists for arrangements that lubricate through the open side; fitting 6020-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-2RS bearing?", "a": "A 6020-2RS deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6020 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6020 uses the same ISO 15 envelope (100×150×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6020-2RS have?", "a": "Unless a clearance suffix says otherwise, 6020-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting." }, { "q": "How should 6020-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6020-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 2600 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6020-2RS." } ], "cross_ref": [ { "equiv_sku": "6020-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6020-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6020-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6020-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6020 M (machined brass cage, open arrangement) is the same-size execution on the 100×150×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6404", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6404 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6404 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6404 units.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 6404 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6404 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6404-2Z (shields) and 6404-2RSH (contact seals), not suffix-free 6404.", "The 30.7/15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6404 bearing?", "a": "A 6404 deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6404 mean?", "a": "A bare 6404 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6404?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6404 — the open (unsealed) execution, 20×72×19 mm per ISO 15. Quoted values: C 30.7 kN, C0 15 kN, Pu 0.64 kN, limiting speed 15000 r/min, mass 410 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6404." } ], "cross_ref": [ { "equiv_sku": "6404-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6404-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6404-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6404-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6404", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6405", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6405.", "The 64xx heavy section at 25 mm bore exists for high radial load at moderate rpm; its 80 mm OD and 21 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6405 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6405 units.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6405 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6405 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6405-2Z (shields) and 6405-2RSH (contact seals), not suffix-free 6405.", "The 35.8/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6405 bearing?", "a": "A 6405 deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6405 mean?", "a": "A bare 6405 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6405?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6405 — the open (unsealed) execution, 25×80×21 mm per ISO 15. Quoted values: C 35.8 kN, C0 19.3 kN, Pu 0.815 kN, limiting speed 13000 r/min, mass 540 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6405." } ], "cross_ref": [ { "equiv_sku": "6405-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6405-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6405-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6405-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6405", "material": "GCr15", "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6406", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6406.", "The 64xx heavy section at 30 mm bore exists for high radial load at moderate rpm; its 90 mm OD and 23 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "Storage matters for open bearings: 6406 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6406 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6406.", "The open 6406 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6406-2Z (shields) and 6406-2RSH (contact seals), not suffix-free 6406.", "The 43.6/23.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6406 bearing?", "a": "A 6406 deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6406 need?", "a": "The open 6406 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6406 mean?", "a": "A bare 6406 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6406?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6406 — the open (unsealed) execution, 30×90×23 mm per ISO 15. Quoted values: C 43.6 kN, C0 23.6 kN, Pu 1 kN, limiting speed 11000 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6406." } ], "cross_ref": [ { "equiv_sku": "6406-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6406-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6406-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6406-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6406", "material": "GCr15", "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6407", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6407.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6407 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6407 units.", "Never mix components between two 6407 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6407 drags the lip and overheats it.", "The open 6407 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6407-2Z (shields) and 6407-2RSH (contact seals), not suffix-free 6407.", "The 55.3/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6407 bearing?", "a": "A 6407 deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6407 mean?", "a": "A bare 6407 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6407 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6407?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6407 — the open (unsealed) execution, 35×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31 kN, Pu 1.29 kN, limiting speed 10000 r/min, mass 970 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6407." } ], "cross_ref": [ { "equiv_sku": "6407-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6407-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6407-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6407-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6407", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6408", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6408 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 40 mm shaft for 6408 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6408 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.", "Never mix components between two 6408 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6408 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6408-2Z (shields) and 6408-2RSH (contact seals), not suffix-free 6408.", "The 63.7/36.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6408 bearing?", "a": "A 6408 deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6408 mean?", "a": "A bare 6408 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6408?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6408 — the open (unsealed) execution, 40×110×27 mm per ISO 15. Quoted values: C 63.7 kN, C0 36.5 kN, Pu 1.53 kN, limiting speed 9000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6408." } ], "cross_ref": [ { "equiv_sku": "6408-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6408-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6408-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6408", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6409", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6409.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6409 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6409 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 29 mm-wide ring of 6409 drags the lip and overheats it.", "The open 6409 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6409-2Z (shields) and 6409-2RSH (contact seals), not suffix-free 6409.", "The 76.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6409 bearing?", "a": "A 6409 deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6409 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6409 need?", "a": "The open 6409 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6409?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6409 — the open (unsealed) execution, 45×120×29 mm per ISO 15. Quoted values: C 76.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8500 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6409." } ], "cross_ref": [ { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6409-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6409-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6409", "material": "GCr15", "dynamic_load_kN": 76.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6410", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore exists for high radial load at moderate rpm; its 130 mm OD and 31 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6410 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6410 units.", "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6410 and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6410 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6410-2Z (shields) and 6410-2RSH (contact seals), not suffix-free 6410.", "The 87.1/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6410 bearing?", "a": "A 6410 deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6410 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6410 need?", "a": "The open 6410 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6410?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6410 — the open (unsealed) execution, 50×130×31 mm per ISO 15. Quoted values: C 87.1 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7500 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6410." } ], "cross_ref": [ { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6410-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6410-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6410", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6411", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6411 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6411 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6411 units.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6411 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6411-2Z (shields) and 6411-2RSH (contact seals), not suffix-free 6411.", "The 99.5/62 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6411 bearing?", "a": "A 6411 deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6411 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6411 need?", "a": "The open 6411 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6411?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6411 — the open (unsealed) execution, 55×140×33 mm per ISO 15. Quoted values: C 99.5 kN, C0 62 kN, Pu 2.6 kN, limiting speed 7000 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6411." } ], "cross_ref": [ { "equiv_sku": "6411-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6411-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6411-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6411", "material": "GCr15", "dynamic_load_kN": 99.5, "static_load_kN": 62, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6412", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6412 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6412 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6412 drags the lip and overheats it.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6412 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6412-2Z (shields) and 6412-2RSH (contact seals), not suffix-free 6412.", "The 108/69.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6412 bearing?", "a": "A 6412 deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6412 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6412 uses the same ISO 15 envelope (60×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6412 have?", "a": "Unless a clearance suffix says otherwise, 6412 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6412 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6412?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6412 — the open (unsealed) execution, 60×150×35 mm per ISO 15. Quoted values: C 108 kN, C0 69.5 kN, Pu 2.9 kN, limiting speed 6300 r/min, mass 2850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6412." } ], "cross_ref": [ { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6412-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6412-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6412", "material": "GCr15", "dynamic_load_kN": 108, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6413", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6413 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6413 against the shaft shoulder while it cools so the ring cannot creep back.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6413 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6413 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6413 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6413 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6413-2Z (shields) and 6413-2RSH (contact seals), not suffix-free 6413.", "The 119/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6413 bearing?", "a": "A 6413 deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6413 mean?", "a": "A bare 6413 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6413?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6413 — the open (unsealed) execution, 65×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 78 kN, Pu 3.15 kN, limiting speed 6000 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6413." } ], "cross_ref": [ { "equiv_sku": "6413-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6413-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6413-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6413", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 78, "fatigue_load_limit_kN": 3.15, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6414", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6414 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 180 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6414 with C3 clearance and re-check the residual value after mounting.", "The 64xx heavy section at 70 mm bore exists for high radial load at moderate rpm; its 180 mm OD and 42 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6414 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×180×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6414-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6414 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6414-2Z (shields) and 6414-2RSH (contact seals), not suffix-free 6414.", "The 143/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6414 bearing?", "a": "A 6414 deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6414 mean?", "a": "A bare 6414 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6414?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6414 — the open (unsealed) execution, 70×180×42 mm per ISO 15. Quoted values: C 143 kN, C0 104 kN, Pu 3.9 kN, limiting speed 5300 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6414." } ], "cross_ref": [ { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6414-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6414", "material": "GCr15", "dynamic_load_kN": 143, "static_load_kN": 104, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61904 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61904 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×37×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61904 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61904.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61904 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61904-2Z (shields) and 61904-2RSH (contact seals), not suffix-free 61904.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904 bearing?", "a": "A 61904 deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61904 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61904 need?", "a": "The open 61904 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61904?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904 — the open (unsealed) execution, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 26000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61904", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61904-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "A 20 mm shaft for 61904 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61904-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61904-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61904-C3. No clearance suffix means normal CN clearance.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61904-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61904-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-2RS bearing?", "a": "A 61904-2RS deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61904-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with an 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 12000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-2RS." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61904-2RS1", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61905 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×42×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61905 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "The open 61905 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61905-2Z (shields) and 61905-2RSH (contact seals), not suffix-free 61905.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905 bearing?", "a": "A 61905 deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61905 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61905 need?", "a": "The open 61905 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61905?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905 — the open (unsealed) execution, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 22000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61905", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61905-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61905-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61905-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61905-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 36000 r/min thermal reference speed.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-2RS bearing?", "a": "A 61905-2RS deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61905-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with an 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61905 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61905-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 10000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-2RS." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61905-2RS1", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 49, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61906 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61906 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61906 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61906 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61906-2Z (shields) and 61906-2RSH (contact seals), not suffix-free 61906.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906 bearing?", "a": "A 61906 deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61906 have?", "a": "Unless a clearance suffix says otherwise, 61906 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61906 and verify the residual clearance after mounting." }, { "q": "How should 61906 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61906 need?", "a": "The open 61906 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61906?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906 — the open (unsealed) execution, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 49 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61906", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61906-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61906-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61906-2RS runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61906-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61906-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61906-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-2RS bearing?", "a": "A 61906-2RS deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61906-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with an 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61906 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61906-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 8500 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-2RS." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61906-2RS1", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61907 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61907 units.", "Never mix components between two 61907 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61907 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61907-2Z (shields) and 61907-2RSH (contact seals), not suffix-free 61907.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907 bearing?", "a": "A 61907 deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61907 mean?", "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61907?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907 — the open (unsealed) execution, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61907", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61907-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 35 mm shaft for 61907 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61907-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61907-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61907-2RS.", "Never mix components between two 61907-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 61907-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-2RS bearing?", "a": "A 61907-2RS deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61907-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61907-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 7500 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-2RS." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61907-2RS1", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61908 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 62 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61908 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61908 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 61908 and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61908 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61908-2Z (shields) and 61908-2RSH (contact seals), not suffix-free 61908.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908 bearing?", "a": "A 61908 deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61908 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61908 uses the same ISO 15 envelope (40×62×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61908 have?", "a": "Unless a clearance suffix says otherwise, 61908 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61908 and verify the residual clearance after mounting." }, { "q": "How should 61908 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61908?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908 — the open (unsealed) execution, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61908", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61908-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-2RS.", "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61908-2RS runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61908-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61908-2RS drags the lip and overheats it.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61908-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-2RS bearing?", "a": "A 61908-2RS deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61908-2RS need?", "a": "61908-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61908 with a housing grease fitting instead." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61908-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61908-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 6700 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-2RS." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61908-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61909 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61909 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61909 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61909-2Z (shields) and 61909-2RSH (contact seals), not suffix-free 61909.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909 bearing?", "a": "A 61909 deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61909 need?", "a": "The open 61909 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61909 mean?", "a": "A bare 61909 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61909?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909 — the open (unsealed) execution, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 13000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61909", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61909-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61909-2RS runs slower and cooler-limited than the open 61909; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61909-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61909-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61909-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-2RS bearing?", "a": "A 61909-2RS deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61909-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61909-2RS need?", "a": "61909-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61909-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 6000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-2RS." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61909-2RS1", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61910 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61910 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×72×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61910 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61910 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61910 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61910-2Z (shields) and 61910-2RSH (contact seals), not suffix-free 61910.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910 bearing?", "a": "A 61910 deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61910 have?", "a": "Unless a clearance suffix says otherwise, 61910 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting." }, { "q": "How should 61910 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61910?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910 — the open (unsealed) execution, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 12000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61910", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61910-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61910-2RS runs slower and cooler-limited than the open 61910; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61910-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61910-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-2RS bearing?", "a": "A 61910-2RS deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61910-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61910-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 5600 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-2RS." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61910-2RS1", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61911 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61911 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "The open 61911 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61911-2Z (shields) and 61911-2RSH (contact seals), not suffix-free 61911.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911 bearing?", "a": "A 61911 deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61911 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61911 have?", "a": "Unless a clearance suffix says otherwise, 61911 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61911?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911 — the open (unsealed) execution, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 11000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61911", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61911-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 80 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61911-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61911 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61911-2RS runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61911-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 61911-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61911-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-2RS bearing?", "a": "A 61911-2RS deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61911-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61911-2RS need?", "a": "61911-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61911 with a housing grease fitting instead." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61911-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 5000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-2RS." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61911-2RS1", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61804.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "The open 61804 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×32×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61804 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61804 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61804-2Z (shields) and 61804-2RSH (contact seals), not suffix-free 61804.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804 bearing?", "a": "A 61804 deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61804 have?", "a": "Unless a clearance suffix says otherwise, 61804 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting." }, { "q": "How should 61804 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61804 need?", "a": "The open 61804 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61804?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804 — the open (unsealed) execution, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 28000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61804", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-2RS", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61804-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "Heat is the enemy of the sealed 61804-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61804-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 61804-2RS and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-2RS.", "SKF catalogues the contact-sealed version as 61804-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-2RS bearing?", "a": "A 61804-2RS deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61804-2RS need?", "a": "61804-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61804 with a housing grease fitting instead." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61804-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61804-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 13000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-2RS." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61804-2RS1", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000", "brand": "SKF", "manufacturer_designation": "SKF 6000", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "The open 6000 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×26×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6000 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6000-C3. No clearance suffix means normal CN clearance.", "The open 6000 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6000-2Z (shields) and 6000-2RSH (contact seals), not suffix-free 6000.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000 bearing?", "a": "A 6000 deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6000 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6000 uses the same ISO 15 envelope (10×26×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6000 have?", "a": "Unless a clearance suffix says otherwise, 6000 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6000 and verify the residual clearance after mounting." }, { "q": "How should 6000 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6000?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000 — the open (unsealed) execution, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 40000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6000-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 26 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6000-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Codes 00–03 are the exception series: 6000 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "Contact seals add drag and heat: 6000-2RS runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6000-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6000-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6000-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed. The single-seal catalogue number is 6000-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6000-RSH exists for arrangements that lubricate through the open side; fitting 6000-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-2RS bearing?", "a": "A 6000-2RS deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6000-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSH — two contact elastomer seals over a lifetime grease fill, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 19000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-2RS." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6000-2RSL.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6200 before committing to the smaller envelope.", "RSR low-friction seals on 6000-RSR run faster than contact-seal 6000-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6000-2RS instead.", "The low-drag lip of 6000-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6000-RSR.", "SKF catalogues the low-friction seal as 6000-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 34000 r/min limiting speed, closer to the open bearing's 67000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-RSR bearing?", "a": "A 6000-RSR deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6000-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSL — two low-friction non-contact elastomer seals, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-RSR." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6000-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6000-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6000-ZZ (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6000-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6000-2RS for that.", "Shielded 6000-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6000-2Z (one shield: 6000-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6000-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6000-2Z for high-contamination positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-ZZ bearing?", "a": "A 6000-ZZ deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6000-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6000-ZZ need?", "a": "6000-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6000-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2Z — two non-contact sheet-metal shields, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 20 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-ZZ." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2RS1 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000-2Z shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6000 shares the 10×26×8 mm envelope but rates differently (4.75/1.96 kN vs 3.97/1.96 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001", "brand": "SKF", "manufacturer_designation": "SKF 6001", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6001 (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6001 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6001-2Z (shields) and 6001-2RSH (contact seals), not suffix-free 6001.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001 bearing?", "a": "A 6001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6001 mean?", "a": "A bare 6001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001 — the open (unsealed) execution, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 38000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6001-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Codes 00–03 are the exception series: 6001 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "Contact seals add drag and heat: 6001-2RS runs slower and cooler-limited than the open 6001; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6001-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6001-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed. The single-seal catalogue number is 6001-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6001-RSH exists for arrangements that lubricate through the open side; fitting 6001-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-2RS bearing?", "a": "A 6001-2RS deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6001-2RS have?", "a": "Unless a clearance suffix says otherwise, 6001-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "How should 6001-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6001-2RS need?", "a": "6001-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6001 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6001-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSH — two contact elastomer seals over a lifetime grease fill, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-2RS." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6001-2RSL.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Codes 00–03 are the exception series: 6001 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "The low-drag lip of 6001-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6001-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6001-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 30000 r/min limiting speed, closer to the open bearing's 60000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-RSR bearing?", "a": "A 6001-RSR deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6001-RSR have?", "a": "Unless a clearance suffix says otherwise, 6001-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "How should 6001-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6001-RSR need?", "a": "6001-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6001 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6001-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSL — two low-friction non-contact elastomer seals, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-RSR." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6001-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6001-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6001-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6201 before committing to the smaller envelope.", "ZZ shields are non-contact: 6001-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.", "Do not wash 6001-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6001-2Z (one shield: 6001-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6001-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6001-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-ZZ bearing?", "a": "A 6001-ZZ deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6001-ZZ need?", "a": "6001-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6001-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6001-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2Z — two non-contact sheet-metal shields, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-ZZ." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2RS1 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001-2Z shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6001 shares the 12×28×8 mm envelope but rates differently (5.4/2.36 kN vs 4.42/2.36 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002", "brand": "SKF", "manufacturer_designation": "SKF 6002", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "The open 6002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6002 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6002.", "The open 6002 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6002-2Z (shields) and 6002-2RSH (contact seals), not suffix-free 6002.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002 bearing?", "a": "A 6002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6002 mean?", "a": "A bare 6002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6002?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002 — the open (unsealed) execution, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 32000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6002-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 32 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6002-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6002-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6002-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6002-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6002-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6002-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6002-RSH exists for arrangements that lubricate through the open side; fitting 6002-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-2RS bearing?", "a": "A 6002-2RS deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6002-2RS have?", "a": "Unless a clearance suffix says otherwise, 6002-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6002 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6002-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSH — two contact elastomer seals over a lifetime grease fill, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 14000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-2RS." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6002-2RSL.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "RSR low-friction seals on 6002-RSR run faster than contact-seal 6002-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6002-2RS instead.", "The non-contact lip of 6002-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 6002-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-RSR bearing?", "a": "A 6002-RSR deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6002-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6002-RSR need?", "a": "6002-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6002 with a housing grease fitting instead." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6002-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSL — two low-friction non-contact elastomer seals, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-RSR." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6002-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6002-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 32 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6002-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 6002 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6202 before committing to the smaller envelope.", "ZZ shields are non-contact: 6002-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6002-2RS for that.", "Shielded 6002-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 6002-2Z (one shield: 6002-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6002-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6002-2Z for high-contamination positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-ZZ bearing?", "a": "A 6002-ZZ deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 6002-ZZ need?", "a": "6002-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6002-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 6002-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2Z — two non-contact sheet-metal shields, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-ZZ." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2RS1 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002-2Z shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6002 shares the 15×32×9 mm envelope but rates differently (5.85/2.85 kN vs 4.88/2.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003", "brand": "SKF", "manufacturer_designation": "SKF 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6003 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6003-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6003.", "The open 6003 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6003-2Z (shields) and 6003-2RSH (contact seals), not suffix-free 6003.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003 bearing?", "a": "A 6003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6003 have?", "a": "Unless a clearance suffix says otherwise, 6003 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6003?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003 — the open (unsealed) execution, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 28000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6003-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6203 before committing to the smaller envelope.", "Contact seals add drag and heat: 6003-2RS runs slower and cooler-limited than the open 6003; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6003-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6003-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6003-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6003-RSH exists for arrangements that lubricate through the open side; fitting 6003-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-2RS bearing?", "a": "A 6003-2RS deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6003-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSH — two contact elastomer seals over a lifetime grease fill, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 13000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-2RS." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6003-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6203 before committing to the smaller envelope.", "The low-drag lip of 6003-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6003-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6003-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-RSR bearing?", "a": "A 6003-RSR deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6003-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6003-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSL — two low-friction non-contact elastomer seals, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-RSR." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 41, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6003-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 6003-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Do not wash 6003-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6003-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6003-ZZ.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6003-2Z (one shield: 6003-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6003-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6003-2Z for high-contamination positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-ZZ bearing?", "a": "A 6003-ZZ deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6003-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6003-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2Z — two non-contact sheet-metal shields, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 41 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-ZZ." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2RS1 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003-2Z shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6003 shares the 17×35×10 mm envelope but rates differently (6.37/3.25 kN vs 4.94/3.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6004-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 69, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6004-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6004-2RSL.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-RSR.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6004-RSR run faster than contact-seal 6004-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6004-2RS instead.", "The non-contact lip of 6004-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6004-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 6004-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-RSR bearing?", "a": "A 6004-RSR deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6004-RSR have?", "a": "Unless a clearance suffix says otherwise, 6004-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting." }, { "q": "How should 6004-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6004-RSR need?", "a": "6004-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6004 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6004-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSL — two low-friction non-contact elastomer seals, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 69 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-RSR." } ], "cross_ref": [ { "equiv_sku": "6004-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6004-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6004-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6004-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×42×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6004-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2RS1 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004-2Z shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6004", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6004 shares the 20×42×12 mm envelope but rates differently (9.95/5 kN vs 8.06/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6005-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6005-2RSL.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6005-RSR run faster than contact-seal 6005-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6005-2RS instead.", "The non-contact lip of 6005-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6005-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 6005-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-RSR bearing?", "a": "A 6005-RSR deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6005-RSR have?", "a": "Unless a clearance suffix says otherwise, 6005-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting." }, { "q": "How should 6005-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6005-RSR need?", "a": "6005-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6005 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6005-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSL — two low-friction non-contact elastomer seals, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-RSR." } ], "cross_ref": [ { "equiv_sku": "6005-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6005-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6005-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6005-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6005-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6005-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2RS1 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005-2Z shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6005", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6005 shares the 25×47×12 mm envelope but rates differently (11.9/6.55 kN vs 8.71/5.85 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6005-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6006-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6006-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.", "The low-drag lip of 6006-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6006-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-RSR.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6006-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-RSR bearing?", "a": "A 6006-RSR deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6006-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6006-RSR need?", "a": "6006-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6006 with a housing grease fitting instead." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6006-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RZ — two low-friction non-contact elastomer seals, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-RSR." } ], "cross_ref": [ { "equiv_sku": "6006-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6006-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2RS1 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006-2Z shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6006", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6006 shares the 30×55×13 mm envelope but rates differently (13.8/8.3 kN vs 11.4/8.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6007-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6007-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "A 35 mm shaft for 6007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6007-RSR run faster than contact-seal 6007-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6007-2RS instead.", "The low-drag lip of 6007-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6007-RSR and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6007-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-RSR bearing?", "a": "A 6007-RSR deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6007-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6007-RSR need?", "a": "6007-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6007-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RZ — two low-friction non-contact elastomer seals, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-RSR." } ], "cross_ref": [ { "equiv_sku": "6007-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6007-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6007-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6007-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6007-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2RS1 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007-2Z shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6007", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6007 shares the 35×62×14 mm envelope but rates differently (16.8/10.2 kN vs 13.8/10.2 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6008-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6008-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 40 mm shaft for 6008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.", "RSR low-friction seals on 6008-RSR run faster than contact-seal 6008-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6008-2RS instead.", "The non-contact lip of 6008-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6008-C3. No clearance suffix means normal CN clearance.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6008-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-RSR bearing?", "a": "A 6008-RSR deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6008-RSR have?", "a": "Unless a clearance suffix says otherwise, 6008-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6008 and verify the residual clearance after mounting." }, { "q": "How should 6008-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6008-RSR need?", "a": "6008-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6008 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6008-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RZ — two low-friction non-contact elastomer seals, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-RSR." } ], "cross_ref": [ { "equiv_sku": "6008-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6008-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6008-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6008-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6008-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2RS1 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008-2Z shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6008", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6008 shares the 40×68×15 mm envelope but rates differently (17.8/11 kN vs 14.6/11.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6010-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6010-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6010-2RZ.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6010 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "The low-drag lip of 6010-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6010-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6010-RSR.", "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6010-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 6010-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-RSR bearing?", "a": "A 6010-RSR deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6010-RSR need?", "a": "6010-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6010 with a housing grease fitting instead." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6010-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6010-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RZ — two low-friction non-contact elastomer seals, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-RSR." } ], "cross_ref": [ { "equiv_sku": "6010-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6010-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6010-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6010-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6010-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2RS1 shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6010-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6010-2Z shares the 50×80×16 mm envelope but rates differently (22.9/15.6 kN vs 19/16.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6012-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6012-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6012-2RZ.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6012-RSR run faster than contact-seal 6012-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6012-2RS instead.", "The non-contact lip of 6012-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6012-RSR drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6012-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-RSR bearing?", "a": "A 6012-RSR deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6012 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6012 uses the same ISO 15 envelope (60×95×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6012-RSR have?", "a": "Unless a clearance suffix says otherwise, 6012-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6012 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6012-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RZ — two low-friction non-contact elastomer seals, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-RSR." } ], "cross_ref": [ { "equiv_sku": "6012-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6012-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6012-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6012-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6015-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6015-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6015-2RZ.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The low-drag lip of 6015-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6015-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 6015-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6015-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6015-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR bearing?", "a": "A 6015-RSR deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6015 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6015 uses the same ISO 15 envelope (75×115×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6015-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RZ — two low-friction non-contact elastomer seals, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-RSR." } ], "cross_ref": [ { "equiv_sku": "6015-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6015-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6015-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6015-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6015-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6015 M (machined brass cage, open arrangement) is the same-size execution on the 75×115×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021", "brand": "SKF", "manufacturer_designation": "SKF 6021", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "The open 6021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6021 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6021 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6021-2Z (shields) and 6021-2RSH (contact seals), not suffix-free 6021.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021 bearing?", "a": "A 6021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6021 mean?", "a": "A bare 6021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021 — the open (unsealed) execution, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 5300 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6021-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6021-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 6021 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "Contact seals add drag and heat: 6021-2RS runs slower and cooler-limited than the open 6021; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6021-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6021-2RS and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6021-2RS.", "SKF catalogues the contact-sealed version as 6021-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6021-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6021-RS1 exists for arrangements that lubricate through the open side; fitting 6021-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-2RS bearing?", "a": "A 6021-2RS deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6021 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6021 uses the same ISO 15 envelope (105×160×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6021-2RS have?", "a": "Unless a clearance suffix says otherwise, 6021-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6021 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6021-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 2400 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-2RS." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6021-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6021-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 105 mm of 6021-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.", "ZZ shields are non-contact: 6021-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6021-2RS for that.", "Shielded 6021-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6021-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6021-2Z (one shield: 6021-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6021-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6021-2Z for high-contamination positions.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-ZZ bearing?", "a": "A 6021-ZZ deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6021-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6021-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6021 and verify the residual clearance after mounting." }, { "q": "How should 6021-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6021-ZZ need?", "a": "6021-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6021-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2Z — two non-contact sheet-metal shields, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 4300 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-ZZ." } ], "cross_ref": [ { "equiv_sku": "6021-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6021-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6021-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6021-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6021 M (machined brass cage, open arrangement) is the same-size execution on the 105×160×26 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022", "brand": "SKF", "manufacturer_designation": "SKF 6022", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 110 mm bore the ring mass is significant: heat 6022 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6022 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6022 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6022-2Z (shields) and 6022-2RSH (contact seals), not suffix-free 6022.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022 bearing?", "a": "A 6022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6022 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6022 need?", "a": "The open 6022 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6022?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022 — the open (unsealed) execution, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 5000 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6022-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6022-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6022-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 110 mm of 6022-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.", "Contact seals add drag and heat: 6022-2RS runs slower and cooler-limited than the open 6022; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6022-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6022-2RS drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6022-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6022-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6022-RS1 exists for arrangements that lubricate through the open side; fitting 6022-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-2RS bearing?", "a": "A 6022-2RS deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6022 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6022 uses the same ISO 15 envelope (110×170×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6022-2RS have?", "a": "Unless a clearance suffix says otherwise, 6022-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6022 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6022-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 2400 r/min, mass 2000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-2RS." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6022-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6022-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6022-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.", "Do not wash 6022-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6022-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6022-2Z (one shield: 6022-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6022-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6022-2Z for high-contamination positions.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-ZZ bearing?", "a": "A 6022-ZZ deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6022-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6022 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6022 uses the same ISO 15 envelope (110×170×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6022-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2Z — two non-contact sheet-metal shields, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 4000 r/min, mass 2050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-ZZ." } ], "cross_ref": [ { "equiv_sku": "6022-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6022-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6022-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6022-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6022 M (machined brass cage, open arrangement) is the same-size execution on the 110×170×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024", "brand": "SKF", "manufacturer_designation": "SKF 6024", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 120 mm of 6024 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6024 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6024 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6024-2Z (shields) and 6024-2RSH (contact seals), not suffix-free 6024.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024 bearing?", "a": "A 6024 deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6024 need?", "a": "The open 6024 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6024 mean?", "a": "A bare 6024 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6024?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024 — the open (unsealed) execution, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 4800 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6024-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6024-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 6024-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.", "Contact seals add drag and heat: 6024-2RS runs slower and cooler-limited than the open 6024; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6024-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-C3. No clearance suffix means normal CN clearance.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6024-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6024-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6024-RS1 exists for arrangements that lubricate through the open side; fitting 6024-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS bearing?", "a": "A 6024-2RS deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6024-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6024-2RS need?", "a": "6024-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6024 with a housing grease fitting instead." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6024-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 2200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-2RS." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6024-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6024-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6024-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6024-2RS for that.", "Do not wash 6024-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6024-2Z (one shield: 6024-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6024-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6024-2Z for high-contamination positions.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ bearing?", "a": "A 6024-ZZ deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6024-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6024-ZZ need?", "a": "6024-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6024-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2Z — two non-contact sheet-metal shields, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 3800 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-ZZ." } ], "cross_ref": [ { "equiv_sku": "6024-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6024-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6024-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6024-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6024-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6024 MA (machined brass cage, open arrangement) is the same-size execution on the 120×180×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026", "brand": "SKF", "manufacturer_designation": "SKF 6026", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 130 mm of 6026 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6026 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-C3. No clearance suffix means normal CN clearance.", "The open 6026 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6026-2Z (shields) and 6026-2RSH (contact seals), not suffix-free 6026.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026 bearing?", "a": "A 6026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6026 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6026 need?", "a": "The open 6026 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6026?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026 — the open (unsealed) execution, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 4300 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6026-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6026-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 130 mm of 6026-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Contact seals add drag and heat: 6026-2RS runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6026-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6026-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 6026-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6026-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6026-RS1 exists for arrangements that lubricate through the open side; fitting 6026-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS bearing?", "a": "A 6026-2RS deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6026 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6026-2RS have?", "a": "Unless a clearance suffix says otherwise, 6026-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6026 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6026-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 2000 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-2RS." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6026-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6026-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6026-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6026 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 130 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6226 before committing to the smaller envelope.", "Do not wash 6026-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6026-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF spells the shielded version 6026-2Z (one shield: 6026-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6026-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6026-2Z for high-contamination positions.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ bearing?", "a": "A 6026-ZZ deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6026 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6026-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2Z — two non-contact sheet-metal shields, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 3400 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-ZZ." } ], "cross_ref": [ { "equiv_sku": "6026-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6026-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6026-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6026-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6026 M (machined brass cage, open arrangement) is the same-size execution on the 130×200×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028", "brand": "SKF", "manufacturer_designation": "SKF 6028", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Storage matters for open bearings: 6028 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Never mix components between two 6028 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028.", "The open 6028 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6028-2Z (shields) and 6028-2RSH (contact seals), not suffix-free 6028.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028 bearing?", "a": "A 6028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6028 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6028 need?", "a": "The open 6028 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6028?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028 — the open (unsealed) execution, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 4000 r/min, mass 3450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6028-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6028-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.", "Contact seals add drag and heat: 6028-2RS runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6028-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-2RS.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6028-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6028-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6028-RS1 exists for arrangements that lubricate through the open side; fitting 6028-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS bearing?", "a": "A 6028-2RS deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6028-2RS need?", "a": "6028-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6028 with a housing grease fitting instead." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6028-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 1800 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-2RS." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6028-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6028-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Shielded 6028-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6028-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF spells the shielded version 6028-2Z (one shield: 6028-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6028-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6028-2Z for high-contamination positions.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ bearing?", "a": "A 6028-ZZ deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6028-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6028-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6028 and verify the residual clearance after mounting." }, { "q": "How should 6028-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6028-ZZ need?", "a": "6028-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 6028-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2Z — two non-contact sheet-metal shields, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 3200 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-ZZ." } ], "cross_ref": [ { "equiv_sku": "6028-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6028-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×210×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6028-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6028-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6028 M (machined brass cage, open arrangement) is the same-size execution on the 140×210×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030", "brand": "SKF", "manufacturer_designation": "SKF 6030", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 150 mm of 6030 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6030 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6030-2Z (shields) and 6030-2RSH (contact seals), not suffix-free 6030.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030 bearing?", "a": "A 6030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6030 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6030 need?", "a": "The open 6030 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6030?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030 — the open (unsealed) execution, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3800 r/min, mass 4300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6030-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6030-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 150 mm of 6030-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6030-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6030-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6000 r/min thermal reference speed. The single-seal catalogue number is 6030-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6030-RS1 exists for arrangements that lubricate through the open side; fitting 6030-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS bearing?", "a": "A 6030-2RS deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6030 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6030-2RS have?", "a": "Unless a clearance suffix says otherwise, 6030-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting." }, { "q": "How should 6030-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6030-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2RS1 — two contact elastomer seals over a lifetime grease fill, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 1700 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-2RS." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6030-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6030-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6030-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.", "ZZ shields are non-contact: 6030-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Do not wash 6030-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6030-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6030-2Z (one shield: 6030-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6030-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6030-2Z for high-contamination positions.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ bearing?", "a": "A 6030-ZZ deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6030-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2Z — two non-contact sheet-metal shields, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-ZZ." } ], "cross_ref": [ { "equiv_sku": "6030-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6030-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6030-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6030-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6030-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6030-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6030-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6030 M (machined brass cage, open arrangement) is the same-size execution on the 150×225×35 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032", "brand": "SKF", "manufacturer_designation": "SKF 6032", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6032 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "The housing bore for the 240 mm OD should be round within IT7; an oval bore pinches the outer ring of 6032 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6032 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6032-2Z (shields) and 6032-2RSH (contact seals), not suffix-free 6032.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032 bearing?", "a": "A 6032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6032 need?", "a": "The open 6032 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6032 mean?", "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6032?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032 — the open (unsealed) execution, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 3600 r/min, mass 5200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6032-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6032-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.", "Contact seals add drag and heat: 6032-2RS runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6032-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6032-2RS.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6032-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6032-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6032-RS1 exists for arrangements that lubricate through the open side; fitting 6032-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS bearing?", "a": "A 6032-2RS deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6032-2RS need?", "a": "6032-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6032 with a housing grease fitting instead." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6032-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 6032-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2RS1 — two contact elastomer seals over a lifetime grease fill, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 1600 r/min, mass 5300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-2RS." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6032-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 5400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6032-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6032-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 160 mm of 6032-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6032-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Do not wash 6032-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 6032-ZZ drags the lip and overheats it.", "SKF spells the shielded version 6032-2Z (one shield: 6032-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6032-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6032-2Z for high-contamination positions.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ bearing?", "a": "A 6032-ZZ deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6032 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6032-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6032-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6032 and verify the residual clearance after mounting." }, { "q": "How should 6032-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6032-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2Z — two non-contact sheet-metal shields, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 2800 r/min, mass 5400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-ZZ." } ], "cross_ref": [ { "equiv_sku": "6032-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6032-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6032-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6032-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6032 M (machined brass cage, open arrangement) is the same-size execution on the 160×240×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6034", "brand": "SKF", "manufacturer_designation": "SKF 6034", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6034 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 260 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 170 mm bore the ring mass is significant: heat 6034 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 170 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6234 before committing to the smaller envelope.", "The open 6034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6034 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 170 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6034.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 42 mm-wide ring of 6034 drags the lip and overheats it.", "The open 6034 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6034-2Z (shields) and 6034-2RSH (contact seals), not suffix-free 6034.", "The 168/173 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6034 bearing?", "a": "A 6034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6034 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6034 need?", "a": "The open 6034 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6034?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6034 — the open (unsealed) execution, 170×260×42 mm per ISO 15. Quoted values: C 168 kN, C0 173 kN, Pu 5 kN, limiting speed 3200 r/min, mass 7000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6034." } ], "cross_ref": [ { "equiv_sku": "6034-2RS", "equiv_brand": "FAG", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6034-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6034-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6034-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6034-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6034-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6034-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6034-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6034 M (machined brass cage, open arrangement) is the same-size execution on the 170×260×42 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6036", "brand": "SKF", "manufacturer_designation": "SKF 6036", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6036 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6036 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6036 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6036-2Z (shields) and 6036-2RSH (contact seals), not suffix-free 6036.", "The 190/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6036 bearing?", "a": "A 6036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6036 have?", "a": "Unless a clearance suffix says otherwise, 6036 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6036 and verify the residual clearance after mounting." }, { "q": "How should 6036 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6036 need?", "a": "The open 6036 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6036?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6036 — the open (unsealed) execution, 180×280×46 mm per ISO 15. Quoted values: C 190 kN, C0 200 kN, Pu 5.6 kN, limiting speed 3000 r/min, mass 9100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6036." } ], "cross_ref": [ { "equiv_sku": "6036-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6036-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6036-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6036-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6036-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6036 M (machined brass cage, open arrangement) is the same-size execution on the 180×280×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6038", "brand": "SKF", "manufacturer_designation": "SKF 6038", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 216, "fatigue_load_limit_kN": 5.85, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 190 mm bore the ring mass is significant: heat 6038 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6038 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6038 units.", "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6038.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6038 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6038-2Z (shields) and 6038-2RSH (contact seals), not suffix-free 6038.", "The 195/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6038 bearing?", "a": "A 6038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6038 have?", "a": "Unless a clearance suffix says otherwise, 6038 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6038 and verify the residual clearance after mounting." }, { "q": "How should 6038 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6038 need?", "a": "The open 6038 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6038?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6038 — the open (unsealed) execution, 190×290×46 mm per ISO 15. Quoted values: C 195 kN, C0 216 kN, Pu 5.85 kN, limiting speed 3000 r/min, mass 9550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6038." } ], "cross_ref": [ { "equiv_sku": "6038-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6038-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6038-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6038-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6038 M (machined brass cage, open arrangement) is the same-size execution on the 190×290×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6044", "brand": "SKF", "manufacturer_designation": "SKF 6044", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 247, "static_load_kN": 290, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 220 mm of 6044 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6044 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6044 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6044-2Z (shields) and 6044-2RSH (contact seals), not suffix-free 6044.", "The 247/290 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6044 bearing?", "a": "A 6044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6044 mean?", "a": "A bare 6044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6044 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6044 uses the same ISO 15 envelope (220×340×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6044?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6044 — the open (unsealed) execution, 220×340×56 mm per ISO 15. Quoted values: C 247 kN, C0 290 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6044." } ], "cross_ref": [ { "equiv_sku": "6044-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6044-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6044-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6044-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6044 M (machined brass cage, open arrangement) is the same-size execution on the 220×340×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6048", "brand": "SKF", "manufacturer_designation": "SKF 6048", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 315, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 17000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 240 mm of 6048 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6048 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6048 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6048-C3. No clearance suffix means normal CN clearance.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6048 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6048-2Z (shields) and 6048-2RSH (contact seals), not suffix-free 6048.", "The 255/315 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6048 bearing?", "a": "A 6048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 240 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (360×56 mm, 60.0 mm radial section) at 240 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6048 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6048 uses the same ISO 15 envelope (240×360×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6048 have?", "a": "Unless a clearance suffix says otherwise, 6048 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6048 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6048?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6048 — the open (unsealed) execution, 240×360×56 mm per ISO 15. Quoted values: C 255 kN, C0 315 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 17000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6048." } ], "cross_ref": [ { "equiv_sku": "6048-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6048-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6048-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6048 M (machined brass cage, open arrangement) is the same-size execution on the 240×360×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6052", "brand": "SKF", "manufacturer_designation": "SKF 6052", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 291, "static_load_kN": 375, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 25000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6052 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 52 by five gives the 260 mm bore; the 400 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 260 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 6052 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Choosing the 60xx extra-light section saves radial space at 260 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6252 before committing to the smaller envelope.", "The open 6052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6052 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6052.", "The open 6052 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6052-2Z (shields) and 6052-2RSH (contact seals), not suffix-free 6052.", "The 291/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6052 bearing?", "a": "A 6052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6052 mean?", "a": "A bare 6052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 260 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (400×65 mm, 70.0 mm radial section) at 260 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6052 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6052 uses the same ISO 15 envelope (260×400×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6052?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6052 — the open (unsealed) execution, 260×400×65 mm per ISO 15. Quoted values: C 291 kN, C0 375 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 25000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6052." } ], "cross_ref": [ { "equiv_sku": "6052-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6052-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6052 M (machined brass cage, open arrangement) is the same-size execution on the 260×400×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6056", "brand": "SKF", "manufacturer_designation": "SKF 6056", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 302, "static_load_kN": 405, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6056 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 420 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 280 mm of 6056 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Choosing the 60xx extra-light section saves radial space at 280 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6256 before committing to the smaller envelope.", "Storage matters for open bearings: 6056 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6056 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 65 mm-wide ring of 6056 drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6056.", "The open 6056 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6056-2Z (shields) and 6056-2RSH (contact seals), not suffix-free 6056.", "The 302/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6056 bearing?", "a": "A 6056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6056 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6056 need?", "a": "The open 6056 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6056?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6056 — the open (unsealed) execution, 280×420×65 mm per ISO 15. Quoted values: C 302 kN, C0 405 kN, Pu 9.3 kN, limiting speed 1900 r/min, mass 26000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6056." } ], "cross_ref": [ { "equiv_sku": "6056-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×420×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6056-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6056 M (machined brass cage, open arrangement) is the same-size execution on the 280×420×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800", "brand": "SKF", "manufacturer_designation": "SKF 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 61800 (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6200.", "The open 61800 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×19×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61800 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61800 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61800.", "The open 61800 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61800-2Z (shields) and 61800-2RSH (contact seals), not suffix-free 61800.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800 bearing?", "a": "A 61800 deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61800 mean?", "a": "A bare 61800 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61800?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800 — the open (unsealed) execution, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 48000 r/min, mass 5 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61800-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61800-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 61800 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6200.", "Contact seals add drag and heat: 61800-2RS runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61800-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 19 mm OD should be round within IT7; an oval bore pinches the outer ring of 61800-2RS and shows up later as two-point loaded raceway wear.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61800-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 22000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 80000 r/min thermal reference speed.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-2RS bearing?", "a": "A 61800-2RS deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61800-2RS have?", "a": "Unless a clearance suffix says otherwise, 61800-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61800 and verify the residual clearance after mounting." }, { "q": "How should 61800-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61800-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 22000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-2RS." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61800-2Z.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "Do not wash 61800-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61800-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 61800-2Z (one shield: 61800-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-ZZ bearing?", "a": "A 61800-ZZ deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61800-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2Z — two non-contact sheet-metal shields, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 38000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-ZZ." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2RS1 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800-2Z shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61800 shares the 10×19×5 mm envelope but rates differently (1.72/0.83 kN vs 1.48/0.83 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801", "brand": "SKF", "manufacturer_designation": "SKF 61801", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Storage matters for open bearings: 61801 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 21 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61801.", "The open 61801 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61801-2Z (shields) and 61801-2RSH (contact seals), not suffix-free 61801.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801 bearing?", "a": "A 61801 deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61801 need?", "a": "The open 61801 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61801 mean?", "a": "A bare 61801 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61801?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801 — the open (unsealed) execution, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 43000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61801-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61801-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Contact seals add drag and heat: 61801-2RS runs slower and cooler-limited than the open 61801; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61801-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61801-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61801-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-2RS bearing?", "a": "A 61801-2RS deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61801-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61801-2RS need?", "a": "61801-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61801 with a housing grease fitting instead." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61801-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 20000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-2RS." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61801-2Z.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 61801 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6201.", "ZZ shields are non-contact: 61801-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61801-2RS for that.", "Shielded 61801-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61801-ZZ drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61801-2Z (one shield: 61801-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-ZZ bearing?", "a": "A 61801-ZZ deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61801-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61801-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting." }, { "q": "How should 61801-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61801-ZZ need?", "a": "61801-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61801-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2Z — two non-contact sheet-metal shields, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 36000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-ZZ." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2RS1 shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61801-2Z shares the 12×21×5 mm envelope but rates differently (1.74/0.915 kN vs 1.51/0.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802", "brand": "SKF", "manufacturer_designation": "SKF 61802", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61802 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 24 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Codes 00–03 are the exception series: 61802 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6202.", "The open 61802 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×24×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61802.", "The open 61802 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61802-2Z (shields) and 61802-2RSH (contact seals), not suffix-free 61802.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802 bearing?", "a": "A 61802 deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61802 mean?", "a": "A bare 61802 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61802 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61802?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802 — the open (unsealed) execution, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 38000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61802-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61802-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Contact seals add drag and heat: 61802-2RS runs slower and cooler-limited than the open 61802; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61802-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61802-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61802-2RS.", "SKF catalogues the contact-sealed version as 61802-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-2RS bearing?", "a": "A 61802-2RS deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61802 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61802-2RS have?", "a": "Unless a clearance suffix says otherwise, 61802-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61802 and verify the residual clearance after mounting." }, { "q": "How should 61802-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61802-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 17000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-2RS." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61802-2Z.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 61802-ZZ (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Do not wash 61802-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61802-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61802-2Z (one shield: 61802-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-ZZ bearing?", "a": "A 61802-ZZ deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61802-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61802-ZZ need?", "a": "61802-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61802-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2Z — two non-contact sheet-metal shields, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 30000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-ZZ." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2RS1 shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61802-2Z shares the 15×24×5 mm envelope but rates differently (1.9/1.1 kN vs 1.65/1.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803", "brand": "SKF", "manufacturer_designation": "SKF 61803", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61803 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Miniature bearings like 61803 (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The open 61803 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×26×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61803 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61803 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61803 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61803-2Z (shields) and 61803-2RSH (contact seals), not suffix-free 61803.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803 bearing?", "a": "A 61803 deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61803 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61803 need?", "a": "The open 61803 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61803?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803 — the open (unsealed) execution, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 34000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61803-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61803-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Heat is the enemy of the sealed 61803-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61803-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61803-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-2RS bearing?", "a": "A 61803-2RS deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61803 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61803-2RS have?", "a": "Unless a clearance suffix says otherwise, 61803-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting." }, { "q": "How should 61803-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61803-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 16000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-2RS." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61803-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 61803 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The low-drag lip of 61803-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61803-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61803-RSR.", "SKF catalogues the low-friction seal as 61803-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-RSR bearing?", "a": "A 61803-RSR deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61803-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61803 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61803-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RZ — two low-friction non-contact elastomer seals, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-RSR." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61803-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Miniature bearings like 61803-ZZ (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Do not wash 61803-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61803-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61803-ZZ drags the lip and overheats it.", "SKF spells the shielded version 61803-2Z (one shield: 61803-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-ZZ bearing?", "a": "A 61803-ZZ deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61803-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61803-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting." }, { "q": "How should 61803-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61803-ZZ need?", "a": "61803-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61803-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2Z — two non-contact sheet-metal shields, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-ZZ." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2RS1 shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61803-2Z shares the 17×26×5 mm envelope but rates differently (2.03/1.27 kN vs 1.78/1.27 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61804-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61804-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.", "RSR low-friction seals on 61804-RSR run faster than contact-seal 61804-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61804-2RS instead.", "The non-contact lip of 61804-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61804-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-RSR.", "SKF catalogues the low-friction seal as 61804-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-RSR bearing?", "a": "A 61804-RSR deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61804 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61804 uses the same ISO 15 envelope (20×32×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61804-RSR have?", "a": "Unless a clearance suffix says otherwise, 61804-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting." }, { "q": "How should 61804-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61804-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RZ — two low-friction non-contact elastomer seals, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 22000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-RSR." } ], "cross_ref": [ { "equiv_sku": "61804-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61804-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2RS1 shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61804-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61804-2Z shares the 20×32×7 mm envelope but rates differently (4.03/2.32 kN vs 3.12/2.08 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805", "brand": "SKF", "manufacturer_designation": "SKF 61805", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61805 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.", "Storage matters for open bearings: 61805 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61805 drags the lip and overheats it.", "The open 61805 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61805-2Z (shields) and 61805-2RSH (contact seals), not suffix-free 61805.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805 bearing?", "a": "A 61805 deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61805 have?", "a": "Unless a clearance suffix says otherwise, 61805 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61805 and verify the residual clearance after mounting." }, { "q": "How should 61805 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61805 need?", "a": "The open 61805 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61805?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805 — the open (unsealed) execution, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 24000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61805-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61805-2RS.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "Contact seals add drag and heat: 61805-2RS runs slower and cooler-limited than the open 61805; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61805-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never mix components between two 61805-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61805-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-2RS bearing?", "a": "A 61805-2RS deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61805 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61805-2RS have?", "a": "Unless a clearance suffix says otherwise, 61805-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61805 and verify the residual clearance after mounting." }, { "q": "How should 61805-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61805-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 11000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-2RS." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61805-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61805-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.", "The low-drag lip of 61805-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61805-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61805-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-RSR bearing?", "a": "A 61805-RSR deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61805-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61805 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61805-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RZ — two low-friction non-contact elastomer seals, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 19000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-RSR." } ], "cross_ref": [ { "equiv_sku": "61805-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61805-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61805-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2RS1 shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61805-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61805-2Z shares the 25×37×7 mm envelope but rates differently (4.36/2.6 kN vs 3.38/2.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806", "brand": "SKF", "manufacturer_designation": "SKF 61806", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 30 mm shaft for 61806 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "The open 61806 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×42×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61806 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61806 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61806-2Z (shields) and 61806-2RSH (contact seals), not suffix-free 61806.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806 bearing?", "a": "A 61806 deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61806 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61806 need?", "a": "The open 61806 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61806?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806 — the open (unsealed) execution, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 20000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61806-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61806-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "Heat is the enemy of the sealed 61806-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61806-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61806-2RS.", "SKF catalogues the contact-sealed version as 61806-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-2RS bearing?", "a": "A 61806-2RS deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61806-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 9500 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-2RS." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61806-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61806-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61806-RSR.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 30 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6206.", "The low-drag lip of 61806-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61806-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 61806-RSR and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61806-RSR.", "SKF catalogues the low-friction seal as 61806-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-RSR bearing?", "a": "A 61806-RSR deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61806 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61806 uses the same ISO 15 envelope (30×42×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61806-RSR have?", "a": "Unless a clearance suffix says otherwise, 61806-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61806 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61806-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RZ — two low-friction non-contact elastomer seals, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 16000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-RSR." } ], "cross_ref": [ { "equiv_sku": "61806-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61806-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61806-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807", "brand": "SKF", "manufacturer_designation": "SKF 61807", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "A 35 mm shaft for 61807 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "The open 61807 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×47×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61807.", "The open 61807 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61807-2Z (shields) and 61807-2RSH (contact seals), not suffix-free 61807.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807 bearing?", "a": "A 61807 deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61807 mean?", "a": "A bare 61807 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61807?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807 — the open (unsealed) execution, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 18000 r/min, mass 29 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61807-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61807-2RS.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.", "Contact seals add drag and heat: 61807-2RS runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61807-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61807-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61807-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-2RS bearing?", "a": "A 61807-2RS deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61807-2RS have?", "a": "Unless a clearance suffix says otherwise, 61807-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61807 and verify the residual clearance after mounting." }, { "q": "How should 61807-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61807-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 8500 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-2RS." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61807-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61807-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "A 35 mm shaft for 61807 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.", "The low-drag lip of 61807-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61807-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-RSR.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61807-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-RSR bearing?", "a": "A 61807-RSR deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61807-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61807 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61807-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RZ — two low-friction non-contact elastomer seals, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 15000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-RSR." } ], "cross_ref": [ { "equiv_sku": "61807-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61807-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61807-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61807-2RS1 shares the 35×47×7 mm envelope but rates differently (4.36/3.35 kN vs 3.71/3.35 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808", "brand": "SKF", "manufacturer_designation": "SKF 61808", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61808.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "Storage matters for open bearings: 61808 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61808 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61808-2Z (shields) and 61808-2RSH (contact seals), not suffix-free 61808.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808 bearing?", "a": "A 61808 deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61808 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61808 uses the same ISO 15 envelope (40×52×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61808 have?", "a": "Unless a clearance suffix says otherwise, 61808 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting." }, { "q": "How should 61808 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61808?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808 — the open (unsealed) execution, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 16000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61808-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61808-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 40 mm shaft for 61808 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "Contact seals add drag and heat: 61808-2RS runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61808-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61808-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-2RS bearing?", "a": "A 61808-2RS deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61808-2RS need?", "a": "61808-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61808 with a housing grease fitting instead." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61808-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61808-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 7500 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-2RS." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61808-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.", "The low-drag lip of 61808-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61808-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61808-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-RSR bearing?", "a": "A 61808-RSR deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61808 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61808 uses the same ISO 15 envelope (40×52×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61808-RSR have?", "a": "Unless a clearance suffix says otherwise, 61808-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61808-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RZ — two low-friction non-contact elastomer seals, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-RSR." } ], "cross_ref": [ { "equiv_sku": "61808-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61808-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61808-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809", "brand": "SKF", "manufacturer_designation": "SKF 61809", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61809.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "Storage matters for open bearings: 61809 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.", "The housing bore for the 58 mm OD should be round within IT7; an oval bore pinches the outer ring of 61809 and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61809 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61809-2Z (shields) and 61809-2RSH (contact seals), not suffix-free 61809.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809 bearing?", "a": "A 61809 deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61809 mean?", "a": "A bare 61809 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809 — the open (unsealed) execution, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 14000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61809-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61809-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "A 45 mm shaft for 61809 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "Heat is the enemy of the sealed 61809-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61809-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61809-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61809-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-2RS bearing?", "a": "A 61809-2RS deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61809 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61809 uses the same ISO 15 envelope (45×58×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61809-2RS have?", "a": "Unless a clearance suffix says otherwise, 61809-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61809 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61809-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 6700 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-2RS." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61809-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.", "The low-drag lip of 61809-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61809-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61809-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 58 mm OD should be round within IT7; an oval bore pinches the outer ring of 61809-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 61809-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-RSR bearing?", "a": "A 61809-RSR deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61809-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61809-RSR need?", "a": "61809-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61809 with a housing grease fitting instead." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61809-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RZ — two low-friction non-contact elastomer seals, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 11000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-RSR." } ], "cross_ref": [ { "equiv_sku": "61809-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61809-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61809-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810", "brand": "SKF", "manufacturer_designation": "SKF 61810", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.", "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "The open 61810 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×65×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.", "Never mix components between two 61810 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61810.", "The open 61810 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61810-2Z (shields) and 61810-2RSH (contact seals), not suffix-free 61810.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810 bearing?", "a": "A 61810 deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61810 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61810 have?", "a": "Unless a clearance suffix says otherwise, 61810 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "How should 61810 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61810?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810 — the open (unsealed) execution, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 13000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61810-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 65 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61810-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "Contact seals add drag and heat: 61810-2RS runs slower and cooler-limited than the open 61810; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61810-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61810-2RS drags the lip and overheats it.", "The housing bore for the 65 mm OD should be round within IT7; an oval bore pinches the outer ring of 61810-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61810-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-2RS bearing?", "a": "A 61810-2RS deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61810-2RS have?", "a": "Unless a clearance suffix says otherwise, 61810-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61810 and verify the residual clearance after mounting." }, { "q": "How should 61810-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61810-2RS need?", "a": "61810-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61810 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61810-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 6000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-2RS." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61810-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "RSR low-friction seals on 61810-RSR run faster than contact-seal 61810-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61810-2RS instead.", "The low-drag lip of 61810-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61810-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-RSR bearing?", "a": "A 61810-RSR deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61810-RSR need?", "a": "61810-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61810 with a housing grease fitting instead." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61810-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61810-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RZ — two low-friction non-contact elastomer seals, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 10000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-RSR." } ], "cross_ref": [ { "equiv_sku": "61810-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61810-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61810-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811", "brand": "SKF", "manufacturer_designation": "SKF 61811", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61811 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "The open 61811 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×72×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61811 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61811 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61811-C3. No clearance suffix means normal CN clearance.", "The open 61811 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61811-2Z (shields) and 61811-2RSH (contact seals), not suffix-free 61811.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811 bearing?", "a": "A 61811 deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61811 have?", "a": "Unless a clearance suffix says otherwise, 61811 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "How should 61811 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61811 need?", "a": "The open 61811 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61811?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811 — the open (unsealed) execution, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 12000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61811-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61811 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "Contact seals add drag and heat: 61811-2RS runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61811-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-2RS.", "SKF catalogues the contact-sealed version as 61811-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-2RS bearing?", "a": "A 61811-2RS deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61811 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61811 uses the same ISO 15 envelope (55×72×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61811-2RS have?", "a": "Unless a clearance suffix says otherwise, 61811-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61811-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 5300 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-2RS." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61811-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61811-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "RSR low-friction seals on 61811-RSR run faster than contact-seal 61811-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61811-2RS instead.", "The non-contact lip of 61811-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61811-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-RSR.", "SKF catalogues the low-friction seal as 61811-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-RSR bearing?", "a": "A 61811-RSR deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61811-RSR have?", "a": "Unless a clearance suffix says otherwise, 61811-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting." }, { "q": "How should 61811-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61811-RSR need?", "a": "61811-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61811 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61811-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RZ — two low-friction non-contact elastomer seals, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 9500 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-RSR." } ], "cross_ref": [ { "equiv_sku": "61811-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61811-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812", "brand": "SKF", "manufacturer_designation": "SKF 61812", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61812 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "The open 61812 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61812 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 78 mm OD should be round within IT7; an oval bore pinches the outer ring of 61812 and shows up later as two-point loaded raceway wear.", "The open 61812 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61812-2Z (shields) and 61812-2RSH (contact seals), not suffix-free 61812.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812 bearing?", "a": "A 61812 deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61812 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61812 need?", "a": "The open 61812 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61812?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812 — the open (unsealed) execution, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61812-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61812-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61812 with C3 clearance and re-check the residual value after mounting.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "Contact seals add drag and heat: 61812-2RS runs slower and cooler-limited than the open 61812; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61812-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61812-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-2RS bearing?", "a": "A 61812-2RS deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61812-2RS need?", "a": "61812-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61812 with a housing grease fitting instead." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61812-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61812-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 4800 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-2RS." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61812-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "RSR low-friction seals on 61812-RSR run faster than contact-seal 61812-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61812-2RS instead.", "The non-contact lip of 61812-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61812-RSR.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61812-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-RSR bearing?", "a": "A 61812-RSR deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61812 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61812 uses the same ISO 15 envelope (60×78×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61812-RSR have?", "a": "Unless a clearance suffix says otherwise, 61812-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61812 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61812-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RZ — two low-friction non-contact elastomer seals, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 8500 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-RSR." } ], "cross_ref": [ { "equiv_sku": "61812-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61812-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813", "brand": "SKF", "manufacturer_designation": "SKF 61813", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "The open 61813 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61813 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61813 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61813-2Z (shields) and 61813-2RSH (contact seals), not suffix-free 61813.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813 bearing?", "a": "A 61813 deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61813 have?", "a": "Unless a clearance suffix says otherwise, 61813 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61813?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813 — the open (unsealed) execution, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 10000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61813-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "Contact seals add drag and heat: 61813-2RS runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61813-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61813-2RS drags the lip and overheats it.", "Never mix components between two 61813-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the contact-sealed version as 61813-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-2RS bearing?", "a": "A 61813-2RS deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61813 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61813-2RS have?", "a": "Unless a clearance suffix says otherwise, 61813-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61813-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 4500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-2RS." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61813-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61813-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61813 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.", "The low-drag lip of 61813-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61813-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61813-RSR drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61813-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-RSR bearing?", "a": "A 61813-RSR deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61813-RSR have?", "a": "Unless a clearance suffix says otherwise, 61813-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting." }, { "q": "How should 61813-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61813-RSR need?", "a": "61813-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61813 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61813-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RZ — two low-friction non-contact elastomer seals, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 8000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-RSR." } ], "cross_ref": [ { "equiv_sku": "61813-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61813-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61813-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814", "brand": "SKF", "manufacturer_designation": "SKF 61814", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61814 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "Storage matters for open bearings: 61814 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814 and shows up later as two-point loaded raceway wear.", "Never mix components between two 61814 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61814 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61814-2Z (shields) and 61814-2RSH (contact seals), not suffix-free 61814.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814 bearing?", "a": "A 61814 deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61814 have?", "a": "Unless a clearance suffix says otherwise, 61814 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61814 and verify the residual clearance after mounting." }, { "q": "How should 61814 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814 need?", "a": "The open 61814 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61814?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814 — the open (unsealed) execution, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 9000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61814-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61814-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.", "Contact seals add drag and heat: 61814-2RS runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61814-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61814-2RS and shows up later as two-point loaded raceway wear.", "SKF catalogues the contact-sealed version as 61814-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS bearing?", "a": "A 61814-2RS deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61814-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61814 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61814 uses the same ISO 15 envelope (70×90×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61814-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 4300 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-2RS." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61814-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "RSR low-friction seals on 61814-RSR run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The non-contact lip of 61814-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61814-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR bearing?", "a": "A 61814-RSR deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 61814-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61814-RSR need?", "a": "61814-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61814-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RZ — two low-friction non-contact elastomer seals, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 7500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-RSR." } ], "cross_ref": [ { "equiv_sku": "61814-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61814-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61814-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815", "brand": "SKF", "manufacturer_designation": "SKF 61815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The open 61815 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×95×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61815 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61815 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61815 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61815-2Z (shields) and 61815-2RSH (contact seals), not suffix-free 61815.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815 bearing?", "a": "A 61815 deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815 — the open (unsealed) execution, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 8500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61815-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61815-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "Heat is the enemy of the sealed 61815-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61815-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61815-C3. No clearance suffix means normal CN clearance.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61815-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS bearing?", "a": "A 61815-2RS deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61815-2RS have?", "a": "Unless a clearance suffix says otherwise, 61815-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "How should 61815-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61815-2RS need?", "a": "61815-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61815 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61815-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 4000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-2RS." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61815-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61815-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.", "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "RSR low-friction seals on 61815-RSR run faster than contact-seal 61815-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61815-2RS instead.", "The non-contact lip of 61815-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61815-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61815-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR bearing?", "a": "A 61815-RSR deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61815 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61815 uses the same ISO 15 envelope (75×95×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61815-RSR have?", "a": "Unless a clearance suffix says otherwise, 61815-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting." }, { "q": "How should 61815-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61815-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RZ — two low-friction non-contact elastomer seals, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 7000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-RSR." } ], "cross_ref": [ { "equiv_sku": "61815-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61815-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61815-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816", "brand": "SKF", "manufacturer_designation": "SKF 61816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61816 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61816 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61816 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61816-2Z (shields) and 61816-2RSH (contact seals), not suffix-free 61816.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816 bearing?", "a": "A 61816 deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61816 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61816 need?", "a": "The open 61816 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61816?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816 — the open (unsealed) execution, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 8000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61816-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61816-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "Heat is the enemy of the sealed 61816-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61816-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-2RS.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61816-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS bearing?", "a": "A 61816-2RS deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61816 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61816 uses the same ISO 15 envelope (80×100×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61816-2RS have?", "a": "Unless a clearance suffix says otherwise, 61816-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61816 and verify the residual clearance after mounting." }, { "q": "How should 61816-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61816-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 3600 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816-2RS." } ], "cross_ref": [ { "equiv_sku": "61816-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61816-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61816-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817", "brand": "SKF", "manufacturer_designation": "SKF 61817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "Storage matters for open bearings: 61817 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.", "Never mix components between two 61817 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61817 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61817-2Z (shields) and 61817-2RSH (contact seals), not suffix-free 61817.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817 bearing?", "a": "A 61817 deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61817 need?", "a": "The open 61817 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61817 mean?", "a": "A bare 61817 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61817?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817 — the open (unsealed) execution, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 7500 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61817-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61817-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61817-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS bearing?", "a": "A 61817-2RS deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61817-2RS need?", "a": "61817-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61817 with a housing grease fitting instead." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61817-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61817-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 3400 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-2RS." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61817-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 85 mm of 61817-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The low-drag lip of 61817-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61817-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 61817-RSR and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61817-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR bearing?", "a": "A 61817-RSR deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61817 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61817-RSR have?", "a": "Unless a clearance suffix says otherwise, 61817-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61817 and verify the residual clearance after mounting." }, { "q": "How should 61817-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61817-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RZ — two low-friction non-contact elastomer seals, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 6000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-RSR." } ], "cross_ref": [ { "equiv_sku": "61817-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61817-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61817-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818", "brand": "SKF", "manufacturer_designation": "SKF 61818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 61818 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "The open 61818 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61818 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61818 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61818 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61818-2Z (shields) and 61818-2RSH (contact seals), not suffix-free 61818.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818 bearing?", "a": "A 61818 deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61818 have?", "a": "Unless a clearance suffix says otherwise, 61818 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "How should 61818 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61818?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818 — the open (unsealed) execution, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 7000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61818-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "Contact seals add drag and heat: 61818-2RS runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61818-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 61818-2RS and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61818-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS bearing?", "a": "A 61818-2RS deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61818-2RS need?", "a": "61818-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61818-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61818-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 3200 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-2RS." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61818-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.", "RSR low-friction seals on 61818-RSR run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61818-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61818-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5600 r/min limiting speed, closer to the open bearing's 11000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR bearing?", "a": "A 61818-RSR deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61818 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61818-RSR have?", "a": "Unless a clearance suffix says otherwise, 61818-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61818-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RZ — two low-friction non-contact elastomer seals, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 5600 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-RSR." } ], "cross_ref": [ { "equiv_sku": "61818-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61818-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61818-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819", "brand": "SKF", "manufacturer_designation": "SKF 61819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61819 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Storage matters for open bearings: 61819 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 61819 and shows up later as two-point loaded raceway wear.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61819-C3. No clearance suffix means normal CN clearance.", "The open 61819 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61819-2Z (shields) and 61819-2RSH (contact seals), not suffix-free 61819.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819 bearing?", "a": "A 61819 deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61819 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61819 have?", "a": "Unless a clearance suffix says otherwise, 61819 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61819?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819 — the open (unsealed) execution, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 6700 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61819-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61819-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 95 mm of 61819-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.", "Heat is the enemy of the sealed 61819-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61819-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61819-2RS.", "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 61819-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS bearing?", "a": "A 61819-2RS deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61819-2RS need?", "a": "61819-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61819 with a housing grease fitting instead." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61819-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the SKF designation and catalogue data for 61819-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 3000 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819-2RS." } ], "cross_ref": [ { "equiv_sku": "61819-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61819-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61819-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820", "brand": "SKF", "manufacturer_designation": "SKF 61820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "Storage matters for open bearings: 61820 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61820 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61820-2Z (shields) and 61820-2RSH (contact seals), not suffix-free 61820.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820 bearing?", "a": "A 61820 deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61820 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61820 uses the same ISO 15 envelope (100×125×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61820 have?", "a": "Unless a clearance suffix says otherwise, 61820 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61820 and verify the residual clearance after mounting." }, { "q": "How should 61820 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61820?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820 — the open (unsealed) execution, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61820-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61820-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 100 mm of 61820-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.", "Contact seals add drag and heat: 61820-2RS runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61820-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61820-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS bearing?", "a": "A 61820-2RS deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61820-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61820-2RS need?", "a": "61820-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61820 with a housing grease fitting instead." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61820-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 3000 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-2RS." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61820-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61820-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The low-drag lip of 61820-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61820-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61820-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61820-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5300 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR bearing?", "a": "A 61820-RSR deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61820-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RZ — two low-friction non-contact elastomer seals, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 5300 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-RSR." } ], "cross_ref": [ { "equiv_sku": "61820-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61820-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61820-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821", "brand": "SKF", "manufacturer_designation": "SKF 61821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61821 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61821 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61821 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61821-2Z (shields) and 61821-2RSH (contact seals), not suffix-free 61821.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821 bearing?", "a": "A 61821 deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61821 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61821 have?", "a": "Unless a clearance suffix says otherwise, 61821 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61821?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821 — the open (unsealed) execution, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 6300 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61821-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 105 mm bore the ring mass is significant: heat 61821 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Heat is the enemy of the sealed 61821-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61821-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61821-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61821-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61821-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS bearing?", "a": "A 61821-2RS deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61821 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61821-2RS have?", "a": "Unless a clearance suffix says otherwise, 61821-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting." }, { "q": "How should 61821-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61821-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 2800 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-2RS." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61821-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61821-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 105 mm of 61821-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "RSR low-friction seals on 61821-RSR run faster than contact-seal 61821-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61821-2RS instead.", "The non-contact lip of 61821-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61821-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61821-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5000 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-RSR bearing?", "a": "A 61821-RSR deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61821-RSR need?", "a": "61821-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61821 with a housing grease fitting instead." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61821-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61821-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RZ — two low-friction non-contact elastomer seals, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 5000 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-RSR." } ], "cross_ref": [ { "equiv_sku": "61821-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61821-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822", "brand": "SKF", "manufacturer_designation": "SKF 61822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61822 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "The open 61822 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61822 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61822 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61822 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61822-2Z (shields) and 61822-2RSH (contact seals), not suffix-free 61822.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822 bearing?", "a": "A 61822 deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61822 mean?", "a": "A bare 61822 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822 — the open (unsealed) execution, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 5600 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61822-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.", "Contact seals add drag and heat: 61822-2RS runs slower and cooler-limited than the open 61822; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61822-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61822-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS bearing?", "a": "A 61822-2RS deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61822-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 2600 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-2RS." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61822-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 110 mm of 61822-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "RSR low-friction seals on 61822-RSR run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The low-drag lip of 61822-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61822-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4500 r/min limiting speed, closer to the open bearing's 9500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR bearing?", "a": "A 61822-RSR deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61822 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61822 uses the same ISO 15 envelope (110×140×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61822-RSR have?", "a": "Unless a clearance suffix says otherwise, 61822-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting." }, { "q": "How should 61822-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61822-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RZ — two low-friction non-contact elastomer seals, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 4500 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-RSR." } ], "cross_ref": [ { "equiv_sku": "61822-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61822-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61822-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824", "brand": "SKF", "manufacturer_designation": "SKF 61824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "The open 61824 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824 and shows up later as two-point loaded raceway wear.", "The open 61824 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61824-2Z (shields) and 61824-2RSH (contact seals), not suffix-free 61824.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824 bearing?", "a": "A 61824 deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61824 have?", "a": "Unless a clearance suffix says otherwise, 61824 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "How should 61824 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61824?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824 — the open (unsealed) execution, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 5300 r/min, mass 510 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61824-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61824-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.", "Contact seals add drag and heat: 61824-2RS runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61824-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61824-2RS.", "SKF catalogues the contact-sealed version as 61824-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS bearing?", "a": "A 61824-2RS deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61824-2RS have?", "a": "Unless a clearance suffix says otherwise, 61824-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "How should 61824-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61824-2RS need?", "a": "61824-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61824 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61824-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 2400 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-2RS." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61824-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61824-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The non-contact lip of 61824-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824-RSR and shows up later as two-point loaded raceway wear.", "Never mix components between two 61824-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 61824-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4300 r/min limiting speed, closer to the open bearing's 8500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR bearing?", "a": "A 61824-RSR deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61824 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61824-RSR have?", "a": "Unless a clearance suffix says otherwise, 61824-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61824-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RZ — two low-friction non-contact elastomer seals, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 4300 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-RSR." } ], "cross_ref": [ { "equiv_sku": "61824-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61824-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61824-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826", "brand": "SKF", "manufacturer_designation": "SKF 61826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61826 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "The open 61826 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61826 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61826 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61826-2Z (shields) and 61826-2RSH (contact seals), not suffix-free 61826.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826 bearing?", "a": "A 61826 deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61826 need?", "a": "The open 61826 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61826 mean?", "a": "A bare 61826 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61826?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826 — the open (unsealed) execution, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 4800 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61826-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "Heat is the enemy of the sealed 61826-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61826-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61826-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61826-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS bearing?", "a": "A 61826-2RS deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61826-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61826 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61826-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 2200 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-2RS." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61826-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.", "The low-drag lip of 61826-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61826-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 130 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61826-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3800 r/min limiting speed, closer to the open bearing's 8000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-RSR bearing?", "a": "A 61826-RSR deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61826-RSR need?", "a": "61826-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61826 with a housing grease fitting instead." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61826-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61826-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RZ — two low-friction non-contact elastomer seals, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 3800 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-RSR." } ], "cross_ref": [ { "equiv_sku": "61826-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828", "brand": "SKF", "manufacturer_designation": "SKF 61828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 820, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "The open 61828 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61828 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61828-C3. No clearance suffix means normal CN clearance.", "The housing bore for the 175 mm OD should be round within IT7; an oval bore pinches the outer ring of 61828 and shows up later as two-point loaded raceway wear.", "The open 61828 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61828-2Z (shields) and 61828-2RSH (contact seals), not suffix-free 61828.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828 bearing?", "a": "A 61828 deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61828 have?", "a": "Unless a clearance suffix says otherwise, 61828 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "How should 61828 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61828 need?", "a": "The open 61828 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61828?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828 — the open (unsealed) execution, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 4500 r/min, mass 820 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61828-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61828-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.", "Contact seals add drag and heat: 61828-2RS runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61828-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 61828-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS bearing?", "a": "A 61828-2RS deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61828 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61828-2RS have?", "a": "Unless a clearance suffix says otherwise, 61828-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting." }, { "q": "How should 61828-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61828-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 2000 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-2RS." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61828-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61828-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The low-drag lip of 61828-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61828-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61828-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3600 r/min limiting speed, closer to the open bearing's 7500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-RSR bearing?", "a": "A 61828-RSR deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61828-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RZ — two low-friction non-contact elastomer seals, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 3600 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-RSR." } ], "cross_ref": [ { "equiv_sku": "61828-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61830", "brand": "SKF", "manufacturer_designation": "SKF 61830", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.8, "static_load_kN": 61, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61830 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "The open 61830 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 61830 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61830 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61830-2Z (shields) and 61830-2RSH (contact seals), not suffix-free 61830.", "The 48.8/61 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61830 bearing?", "a": "A 61830 deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61830 need?", "a": "The open 61830 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61830 mean?", "a": "A bare 61830 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61830?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61830 — the open (unsealed) execution, 150×190×20 mm per ISO 15. Quoted values: C 48.8 kN, C0 61 kN, Pu 1.96 kN, limiting speed 4300 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61830." } ], "cross_ref": [ { "equiv_sku": "61830-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61830-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61830-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61830-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61830-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61830-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61830-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61830", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61830-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61830 MA (machined brass cage, open arrangement) is the same-size execution on the 150×190×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61832", "brand": "SKF", "manufacturer_designation": "SKF 61832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.4, "static_load_kN": 64, "fatigue_load_limit_kN": 2, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "The open 61832 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61832 units.", "The housing bore for the 200 mm OD should be round within IT7; an oval bore pinches the outer ring of 61832 and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832.", "The open 61832 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61832-2Z (shields) and 61832-2RSH (contact seals), not suffix-free 61832.", "The 49.4/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61832 bearing?", "a": "A 61832 deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61832 have?", "a": "Unless a clearance suffix says otherwise, 61832 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61832 and verify the residual clearance after mounting." }, { "q": "How should 61832 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61832 need?", "a": "The open 61832 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61832?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61832 — the open (unsealed) execution, 160×200×20 mm per ISO 15. Quoted values: C 49.4 kN, C0 64 kN, Pu 2 kN, limiting speed 4000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61832." } ], "cross_ref": [ { "equiv_sku": "61832-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61832-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61832-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61832-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61832-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61832-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61832-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×200×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61832", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61834", "brand": "SKF", "manufacturer_designation": "SKF 61834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 61.8, "static_load_kN": 78, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61834 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 61834 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 170 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61834.", "The open 61834 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61834-2Z (shields) and 61834-2RSH (contact seals), not suffix-free 61834.", "The 61.8/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61834 bearing?", "a": "A 61834 deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61834 need?", "a": "The open 61834 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61834 mean?", "a": "A bare 61834 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61834?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61834 — the open (unsealed) execution, 170×215×22 mm per ISO 15. Quoted values: C 61.8 kN, C0 78 kN, Pu 2.4 kN, limiting speed 3600 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61834." } ], "cross_ref": [ { "equiv_sku": "61834-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61834-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61834-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61834-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61834-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61834-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61834-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×215×22 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61834", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61836", "brand": "SKF", "manufacturer_designation": "SKF 61836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 62.4, "static_load_kN": 81.5, "fatigue_load_limit_kN": 2.45, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61836 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 225 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 180 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6236.", "The open 61836 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×225×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61836 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61836 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61836-2Z (shields) and 61836-2RSH (contact seals), not suffix-free 61836.", "The 62.4/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61836 bearing?", "a": "A 61836 deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61836 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61836 uses the same ISO 15 envelope (180×225×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61836 have?", "a": "Unless a clearance suffix says otherwise, 61836 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61836 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61836?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61836 — the open (unsealed) execution, 180×225×22 mm per ISO 15. Quoted values: C 62.4 kN, C0 81.5 kN, Pu 2.45 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61836." } ], "cross_ref": [ { "equiv_sku": "61836-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61836-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61836-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61836-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×225×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61836", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61838", "brand": "SKF", "manufacturer_designation": "SKF 61838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 98, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61838 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61838 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61838-2Z (shields) and 61838-2RSH (contact seals), not suffix-free 61838.", "The 76.1/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61838 bearing?", "a": "A 61838 deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61838 mean?", "a": "A bare 61838 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61838 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61838 uses the same ISO 15 envelope (190×240×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61838?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61838 — the open (unsealed) execution, 190×240×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 98 kN, Pu 2.8 kN, limiting speed 3200 r/min, mass 2250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61838." } ], "cross_ref": [ { "equiv_sku": "61838-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61838-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61838-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61838-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×240×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61838", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61840", "brand": "SKF", "manufacturer_designation": "SKF 61840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 102, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61840 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 250 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 200 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6240.", "Storage matters for open bearings: 61840 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61840 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61840 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61840-2Z (shields) and 61840-2RSH (contact seals), not suffix-free 61840.", "The 76.1/102 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61840 bearing?", "a": "A 61840 deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61840 mean?", "a": "A bare 61840 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 200 mm bore?", "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61840 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61840 uses the same ISO 15 envelope (200×250×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61840?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61840 — the open (unsealed) execution, 200×250×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 102 kN, Pu 2.9 kN, limiting speed 3200 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61840." } ], "cross_ref": [ { "equiv_sku": "61840-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61840-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61840-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×250×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61840", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61844", "brand": "SKF", "manufacturer_designation": "SKF 61844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 78, "static_load_kN": 110, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 220 mm of 61844 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 220 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6244.", "The open 61844 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61844 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61844 drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 220 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61844.", "The open 61844 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61844-2Z (shields) and 61844-2RSH (contact seals), not suffix-free 61844.", "The 78/110 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61844 bearing?", "a": "A 61844 deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61844 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61844 need?", "a": "The open 61844 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61844?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61844 — the open (unsealed) execution, 220×270×24 mm per ISO 15. Quoted values: C 78 kN, C0 110 kN, Pu 3 kN, limiting speed 2800 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61844." } ], "cross_ref": [ { "equiv_sku": "61844-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61844-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61844-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61844-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×270×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61844", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61848", "brand": "SKF", "manufacturer_designation": "SKF 61848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 108, "static_load_kN": 150, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 240 mm bore the ring mass is significant: heat 61848 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61848 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61848.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-C3. No clearance suffix means normal CN clearance.", "The open 61848 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61848-2Z (shields) and 61848-2RSH (contact seals), not suffix-free 61848.", "The 108/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61848 bearing?", "a": "A 61848 deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61848 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61848 uses the same ISO 15 envelope (240×300×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61848 have?", "a": "Unless a clearance suffix says otherwise, 61848 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61848 and verify the residual clearance after mounting." }, { "q": "How should 61848 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61848?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61848 — the open (unsealed) execution, 240×300×28 mm per ISO 15. Quoted values: C 108 kN, C0 150 kN, Pu 3.8 kN, limiting speed 2600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61848." } ], "cross_ref": [ { "equiv_sku": "61848-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61848-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61848-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 240×300×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61848", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61852", "brand": "SKF", "manufacturer_designation": "SKF 61852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 163, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 30.0 mm of radial section separates bore and OD on the 618xx series at 260 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6252.", "The open 61852 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×320×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Measure the shaft, do not trust the drawing: a 260 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61852.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61852 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61852-2Z (shields) and 61852-2RSH (contact seals), not suffix-free 61852.", "The 111/163 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61852 bearing?", "a": "A 61852 deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61852 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61852 uses the same ISO 15 envelope (260×320×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61852 have?", "a": "Unless a clearance suffix says otherwise, 61852 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61852 and verify the residual clearance after mounting." }, { "q": "How should 61852 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 260 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61852?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61852 — the open (unsealed) execution, 260×320×28 mm per ISO 15. Quoted values: C 111 kN, C0 163 kN, Pu 4 kN, limiting speed 2400 r/min, mass 4150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61852." } ], "cross_ref": [ { "equiv_sku": "61852-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61852-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×320×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61852", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61856", "brand": "SKF", "manufacturer_designation": "SKF 61856", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 200, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 6250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61856 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 350 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Only 35.0 mm of radial section separates bore and OD on the 618xx series at 280 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6256.", "Storage matters for open bearings: 61856 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61856 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 61856 drags the lip and overheats it.", "The open 61856 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61856-2Z (shields) and 61856-2RSH (contact seals), not suffix-free 61856.", "The 138/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61856 bearing?", "a": "A 61856 deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 280 mm bore?", "a": "618 is an extra-thin section: 350×33 mm, only 35.0 mm radial section at 280 mm bore, far smaller than a 6256, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61856 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61856 uses the same ISO 15 envelope (280×350×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61856 have?", "a": "Unless a clearance suffix says otherwise, 61856 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61856 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61856?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61856 — the open (unsealed) execution, 280×350×33 mm per ISO 15. Quoted values: C 138 kN, C0 200 kN, Pu 4.75 kN, limiting speed 2200 r/min, mass 6250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61856." } ], "cross_ref": [ { "equiv_sku": "61856-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×350×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61856", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61856-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61856 MA (machined brass cage, open arrangement) is the same-size execution on the 280×350×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61860", "brand": "SKF", "manufacturer_designation": "SKF 61860", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 245, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61860 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 60 by five gives the 300 mm bore; the 380 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 300 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 300 mm bore the ring mass is significant: heat 61860 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 300 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6260.", "The open 61860 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×380×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61860 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61860 drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61860 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61860-2Z (shields) and 61860-2RSH (contact seals), not suffix-free 61860.", "The 172/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61860 bearing?", "a": "A 61860 deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61860 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61860 uses the same ISO 15 envelope (300×380×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61860 have?", "a": "Unless a clearance suffix says otherwise, 61860 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61860 and verify the residual clearance after mounting." }, { "q": "How should 61860 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 300 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61860?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61860 — the open (unsealed) execution, 300×380×38 mm per ISO 15. Quoted values: C 172 kN, C0 245 kN, Pu 5.6 kN, limiting speed 2000 r/min, mass 8900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61860." } ], "cross_ref": [ { "equiv_sku": "61860-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 300×380×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61860", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61860-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61860 MA (machined brass cage, open arrangement) is the same-size execution on the 300×380×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61864", "brand": "SKF", "manufacturer_designation": "SKF 61864", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 255, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61864 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61864 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61864-2Z (shields) and 61864-2RSH (contact seals), not suffix-free 61864.", "The 172/255 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61864 bearing?", "a": "A 61864 deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61864 mean?", "a": "A bare 61864 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61864 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61864 uses the same ISO 15 envelope (320×400×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61864?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61864 — the open (unsealed) execution, 320×400×38 mm per ISO 15. Quoted values: C 172 kN, C0 255 kN, Pu 5.7 kN, limiting speed 1900 r/min, mass 9500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61864." } ], "cross_ref": [ { "equiv_sku": "61864-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 320×400×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61864-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61864 MA (machined brass cage, open arrangement) is the same-size execution on the 320×400×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61868", "brand": "SKF", "manufacturer_designation": "SKF 61868", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 275, "fatigue_load_limit_kN": 6, "reference_speed_rpm": 2800, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61868 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 68 by five gives the 340 mm bore; the 420 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 340 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 340 mm bore the ring mass is significant: heat 61868 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 40.0 mm of radial section separates bore and OD on the 618xx series at 340 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6268.", "Storage matters for open bearings: 61868 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "A 340 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61868.", "The open 61868 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61868-2Z (shields) and 61868-2RSH (contact seals), not suffix-free 61868.", "The 178/275 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61868 bearing?", "a": "A 61868 deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61868 bore code work?", "a": "The last two digits of 61868 are bore code 68, giving 68 × 5 = 340 mm bore. The 420 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61868 mean?", "a": "A bare 61868 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 340 mm bore?", "a": "618 is an extra-thin section: 420×38 mm, only 40.0 mm radial section at 340 mm bore, far smaller than a 6268, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61868?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61868 — the open (unsealed) execution, 340×420×38 mm per ISO 15. Quoted values: C 178 kN, C0 275 kN, Pu 6 kN, limiting speed 1800 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61868." } ], "cross_ref": [ { "equiv_sku": "61868-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 340×420×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61868-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61868 MA (machined brass cage, open arrangement) is the same-size execution on the 340×420×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900", "brand": "SKF", "manufacturer_designation": "SKF 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61900 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Codes 00–03 are the exception series: 61900 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61900 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×22×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61900 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61900 drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 22 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61900.", "The open 61900 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61900-2Z (shields) and 61900-2RSH (contact seals), not suffix-free 61900.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900 bearing?", "a": "A 61900 deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61900 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61900 have?", "a": "Unless a clearance suffix says otherwise, 61900 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "How should 61900 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61900?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900 — the open (unsealed) execution, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 45000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61900-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61900-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Miniature bearings like 61900-2RS (10 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61900-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61900-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61900-2RS.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61900-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-2RS bearing?", "a": "A 61900-2RS deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61900-2RS have?", "a": "Unless a clearance suffix says otherwise, 61900-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "How should 61900-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61900-2RS need?", "a": "61900-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61900 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61900-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 20000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-2RS." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61900-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61900-2Z.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 10 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61900-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61900-2RS for that.", "Do not wash 61900-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 22 mm OD should be round within IT7; an oval bore pinches the outer ring of 61900-ZZ and shows up later as two-point loaded raceway wear.", "SKF spells the shielded version 61900-2Z (one shield: 61900-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-ZZ bearing?", "a": "A 61900-ZZ deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61900-ZZ need?", "a": "61900-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61900-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 61900-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2Z — two non-contact sheet-metal shields, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 36000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-ZZ." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2RS1 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900-2Z shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61900 shares the 10×22×6 mm envelope but rates differently (2.7/1.27 kN vs 2.34/1.25 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901", "brand": "SKF", "manufacturer_designation": "SKF 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61901 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×24×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61901 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61901 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61901-2Z (shields) and 61901-2RSH (contact seals), not suffix-free 61901.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901 bearing?", "a": "A 61901 deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61901 need?", "a": "The open 61901 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61901 mean?", "a": "A bare 61901 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61901?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901 — the open (unsealed) execution, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 40000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61901-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61901-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61901-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 61901 takes its 12 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61901-2RS runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61901-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-2RS.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61901-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61901-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-2RS bearing?", "a": "A 61901-2RS deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61901-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61901-2RS need?", "a": "61901-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61901 with a housing grease fitting instead." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 61901-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 19000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-2RS." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61901-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61901-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 61901-ZZ (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61901-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61901-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 24 mm OD should be round within IT7; an oval bore pinches the outer ring of 61901-ZZ and shows up later as two-point loaded raceway wear.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF spells the shielded version 61901-2Z (one shield: 61901-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-ZZ bearing?", "a": "A 61901-ZZ deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What lubrication does 61901-ZZ need?", "a": "61901-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61901-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the SKF designation and catalogue data for 61901-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2Z — two non-contact sheet-metal shields, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 32000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-ZZ." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2RS1 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901-2Z shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61901 shares the 12×24×6 mm envelope but rates differently (2.91/1.46 kN vs 2.51/1.46 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902", "brand": "SKF", "manufacturer_designation": "SKF 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 61902 (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61902 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61902 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61902 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61902-2Z (shields) and 61902-2RSH (contact seals), not suffix-free 61902.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902 bearing?", "a": "A 61902 deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61902 have?", "a": "Unless a clearance suffix says otherwise, 61902 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61902?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902 — the open (unsealed) execution, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 34000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61902-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Miniature bearings like 61902-2RS (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61902-2RS runs slower and cooler-limited than the open 61902; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61902-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-2RS.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the contact-sealed version as 61902-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-2RS bearing?", "a": "A 61902-2RS deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61902-2RS have?", "a": "Unless a clearance suffix says otherwise, 61902-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61902-2RS need?", "a": "61902-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61902 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61902-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 16000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-2RS." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61902-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61902-RSR run faster than contact-seal 61902-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61902-2RS instead.", "The non-contact lip of 61902-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-RSR.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61902-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-RSR bearing?", "a": "A 61902-RSR deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61902-RSR have?", "a": "Unless a clearance suffix says otherwise, 61902-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61902-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RZ — two low-friction non-contact elastomer seals, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-RSR." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61902-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61902-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.", "Do not wash 61902-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 61902-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61902-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 61902-2Z (one shield: 61902-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-ZZ bearing?", "a": "A 61902-ZZ deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61902 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61902-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61902-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61902-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2Z — two non-contact sheet-metal shields, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-ZZ." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903", "brand": "SKF", "manufacturer_designation": "SKF 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Codes 00–03 are the exception series: 61903 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section at 17 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61903 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61903 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903.", "The open 61903 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61903-2Z (shields) and 61903-2RSH (contact seals), not suffix-free 61903.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903 bearing?", "a": "A 61903 deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61903 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61903 uses the same ISO 15 envelope (17×30×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61903 have?", "a": "Unless a clearance suffix says otherwise, 61903 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61903?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903 — the open (unsealed) execution, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 32000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61903-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61903-2RS runs slower and cooler-limited than the open 61903; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61903-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903-2RS.", "SKF catalogues the contact-sealed version as 61903-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-2RS bearing?", "a": "A 61903-2RS deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61903 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61903 uses the same ISO 15 envelope (17×30×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61903-2RS have?", "a": "Unless a clearance suffix says otherwise, 61903-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61903-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 14000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-2RS." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61903-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 61903-RSR (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61903-RSR run faster than contact-seal 61903-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61903-2RS instead.", "The low-drag lip of 61903-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61903-RSR.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61903-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-RSR bearing?", "a": "A 61903-RSR deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61903-RSR have?", "a": "Unless a clearance suffix says otherwise, 61903-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-RSR need?", "a": "61903-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61903 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61903-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RZ — two low-friction non-contact elastomer seals, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-RSR." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61903-2Z.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 61903 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61903-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61903-2RS for that.", "Shielded 61903-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 61903-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 61903-2Z (one shield: 61903-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-ZZ bearing?", "a": "A 61903-ZZ deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61903-ZZ have?", "a": "Unless a clearance suffix says otherwise, 61903-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting." }, { "q": "How should 61903-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-ZZ need?", "a": "61903-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the SKF designation and catalogue data for 61903-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2Z — two non-contact sheet-metal shields, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-ZZ." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2RS1 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903-2Z shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61903 shares the 17×30×7 mm envelope but rates differently (4.62/2.55 kN vs 3.97/2.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61904-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61904-2RZ.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61904-RSR.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61904-RSR run faster than contact-seal 61904-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61904-2RS instead.", "The non-contact lip of 61904-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61904-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61904-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 20000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-RSR bearing?", "a": "A 61904-RSR deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61904-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with an 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61904 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61904 uses the same ISO 15 envelope (20×37×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61904-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RZ — two low-friction non-contact elastomer seals, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 20000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-RSR." } ], "cross_ref": [ { "equiv_sku": "61904-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61904-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904-2RS1 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61904", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61904 shares the 20×37×9 mm envelope but rates differently (6.37/3.65 kN vs 5.53/3.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61905-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61905-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61905-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61905-RSR run faster than contact-seal 61905-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61905-2RS instead.", "The non-contact lip of 61905-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61905-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61905-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61905-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 18000 r/min limiting speed, closer to the open bearing's 36000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-RSR bearing?", "a": "A 61905-RSR deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61905 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61905-RSR have?", "a": "Unless a clearance suffix says otherwise, 61905-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting." }, { "q": "How should 61905-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61905-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RZ — two low-friction non-contact elastomer seals, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 18000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-RSR." } ], "cross_ref": [ { "equiv_sku": "61905-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61905-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61905-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61905-2RS1 shares the 25×42×9 mm envelope but rates differently (7.02/4.3 kN vs 6.05/4.5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61906-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61906-2RZ.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section at 30 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61906-RSR run faster than contact-seal 61906-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61906-2RS instead.", "The low-drag lip of 61906-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 61906-RSR and shows up later as two-point loaded raceway wear.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61906-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-RSR bearing?", "a": "A 61906-RSR deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61906-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with an 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61906 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61906-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RZ — two low-friction non-contact elastomer seals, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 15000 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-RSR." } ], "cross_ref": [ { "equiv_sku": "61906-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61906-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906-2RS1 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." }, { "equiv_sku": "W61906", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61906 shares the 30×47×9 mm envelope but rates differently (7.28/4.55 kN vs 6.24/5 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61907-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61907-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-RSR.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61907-RSR run faster than contact-seal 61907-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61907-2RS instead.", "The low-drag lip of 61907-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 61907-RSR and shows up later as two-point loaded raceway wear.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61907-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-RSR bearing?", "a": "A 61907-RSR deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61907 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61907 uses the same ISO 15 envelope (35×55×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61907-RSR have?", "a": "Unless a clearance suffix says otherwise, 61907-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61907 and verify the residual clearance after mounting." }, { "q": "How should 61907-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61907-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RZ — two low-friction non-contact elastomer seals, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 13000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-RSR." } ], "cross_ref": [ { "equiv_sku": "61907-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61907-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61907-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61907-2RS1 shares the 35×55×10 mm envelope but rates differently (10.8/7.8 kN vs 9.36/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61908-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61908-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-RSR.", "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61908-RSR run faster than contact-seal 61908-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61908-2RS instead.", "The non-contact lip of 61908-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61908-RSR.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 61908-RSR drags the lip and overheats it.", "SKF catalogues the low-friction seal as 61908-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-RSR bearing?", "a": "A 61908-RSR deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 61908-RSR need?", "a": "61908-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61908 with a housing grease fitting instead." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61908-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 61908-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RZ — two low-friction non-contact elastomer seals, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 12000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-RSR." } ], "cross_ref": [ { "equiv_sku": "61908-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61908-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61908-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61908-2RS1 shares the 40×62×12 mm envelope but rates differently (13.8/10 kN vs 11.9/9.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61909-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61909-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61909-2RZ.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 45 mm shaft for 61909 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The low-drag lip of 61909-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61909-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909-RSR.", "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61909-RSR.", "SKF catalogues the low-friction seal as 61909-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-RSR bearing?", "a": "A 61909-RSR deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 61909-RSR have?", "a": "Unless a clearance suffix says otherwise, 61909-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61909 and verify the residual clearance after mounting." }, { "q": "How should 61909-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61909-RSR need?", "a": "61909-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61909-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RZ — two low-friction non-contact elastomer seals, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 10000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-RSR." } ], "cross_ref": [ { "equiv_sku": "61909-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61909-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "W61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 61909-2RS1 shares the 45×68×12 mm envelope but rates differently (14/10.8 kN vs 12.1/10.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61910-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61910-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61910 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61910-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61910-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61910-RSR and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 61910-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-RSR bearing?", "a": "A 61910-RSR deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61910 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61910 uses the same ISO 15 envelope (50×72×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61910-RSR have?", "a": "Unless a clearance suffix says otherwise, 61910-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61910-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RZ — two low-friction non-contact elastomer seals, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 9500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-RSR." } ], "cross_ref": [ { "equiv_sku": "61910-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61910-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61911-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61911-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61911-RSR run faster than contact-seal 61911-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61911-2RS instead.", "The low-drag lip of 61911-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 61911-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61911-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-RSR bearing?", "a": "A 61911-RSR deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 61911 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61911-RSR have?", "a": "Unless a clearance suffix says otherwise, 61911-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting." }, { "q": "How should 61911-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61911-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RZ — two low-friction non-contact elastomer seals, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 8500 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-RSR." } ], "cross_ref": [ { "equiv_sku": "61911-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61911-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912", "brand": "SKF", "manufacturer_designation": "SKF 61912", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61912 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61912 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61912 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Never mix components between two 61912 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61912.", "The open 61912 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61912-2Z (shields) and 61912-2RSH (contact seals), not suffix-free 61912.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912 bearing?", "a": "A 61912 deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61912 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61912 need?", "a": "The open 61912 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61912?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912 — the open (unsealed) execution, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 10000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61912-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61912 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61912-2RS runs slower and cooler-limited than the open 61912; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61912-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61912-2RS.", "SKF catalogues the contact-sealed version as 61912-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-2RS bearing?", "a": "A 61912-2RS deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61912 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61912 uses the same ISO 15 envelope (60×85×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61912-2RS have?", "a": "Unless a clearance suffix says otherwise, 61912-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61912 and verify the residual clearance after mounting." }, { "q": "How should 61912-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61912-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 4500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-2RS." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61912-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 85 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61912-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61912-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61912-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61912-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-RSR bearing?", "a": "A 61912-RSR deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61912 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61912 uses the same ISO 15 envelope (60×85×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61912-RSR have?", "a": "Unless a clearance suffix says otherwise, 61912-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61912 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61912-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RZ — two low-friction non-contact elastomer seals, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14.3 kN, Pu 0.6 kN, limiting speed 8000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-RSR." } ], "cross_ref": [ { "equiv_sku": "61912-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61912-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61912-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61912-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61912-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61912-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913", "brand": "SKF", "manufacturer_designation": "SKF 61913", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61913 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61913 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61913-2Z (shields) and 61913-2RSH (contact seals), not suffix-free 61913.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913 bearing?", "a": "A 61913 deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61913 mean?", "a": "A bare 61913 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913 — the open (unsealed) execution, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 9500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61913-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61913-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61913-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61913-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61913-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-2RS bearing?", "a": "A 61913-2RS deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61913 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61913 uses the same ISO 15 envelope (65×90×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61913-2RS have?", "a": "Unless a clearance suffix says otherwise, 61913-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61913 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61913-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 4300 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-2RS." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61913-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61913-RSR run faster than contact-seal 61913-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61913-2RS instead.", "The low-drag lip of 61913-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 61913-RSR and shows up later as two-point loaded raceway wear.", "SKF catalogues the low-friction seal as 61913-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-RSR bearing?", "a": "A 61913-RSR deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61913 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61913 uses the same ISO 15 envelope (65×90×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61913-RSR have?", "a": "Unless a clearance suffix says otherwise, 61913-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61913 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61913-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RZ — two low-friction non-contact elastomer seals, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 7500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-RSR." } ], "cross_ref": [ { "equiv_sku": "61913-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61913-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914", "brand": "SKF", "manufacturer_designation": "SKF 61914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61914 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61914 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61914.", "The open 61914 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61914-2Z (shields) and 61914-2RSH (contact seals), not suffix-free 61914.", "The 23.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914 bearing?", "a": "A 61914 deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61914 need?", "a": "The open 61914 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61914 mean?", "a": "A bare 61914 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61914?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914 — the open (unsealed) execution, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 18.3 kN, Pu 0.9 kN, limiting speed 8500 r/min, mass 340 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61914-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Heat is the enemy of the sealed 61914-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61914-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61914-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS bearing?", "a": "A 61914-2RS deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61914-2RS have?", "a": "Unless a clearance suffix says otherwise, 61914-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting." }, { "q": "How should 61914-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61914-2RS need?", "a": "61914-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61914 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61914-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-2RS." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61914-2RZ.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61914-RSR run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The non-contact lip of 61914-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Never mix components between two 61914-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "SKF catalogues the low-friction seal as 61914-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR bearing?", "a": "A 61914-RSR deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61914-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RZ — two low-friction non-contact elastomer seals, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 7000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-RSR." } ], "cross_ref": [ { "equiv_sku": "61914-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61914-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915", "brand": "SKF", "manufacturer_designation": "SKF 61915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61915 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61915 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61915 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61915 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Never mix components between two 61915 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61915 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61915-2Z (shields) and 61915-2RSH (contact seals), not suffix-free 61915.", "The 24.2/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915 bearing?", "a": "A 61915 deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61915 mean?", "a": "A bare 61915 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61915?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915 — the open (unsealed) execution, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 19.3 kN, Pu 0.965 kN, limiting speed 8000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61915-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61915-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61915-2RS runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-2RS.", "SKF catalogues the contact-sealed version as 61915-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS bearing?", "a": "A 61915-2RS deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 61915-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61915-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 3600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-2RS." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61915-2RZ.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "RSR low-friction seals on 61915-RSR run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-RSR.", "SKF catalogues the low-friction seal as 61915-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6300 r/min limiting speed, closer to the open bearing's 13000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR bearing?", "a": "A 61915-RSR deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61915-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61915 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61915 uses the same ISO 15 envelope (75×105×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61915-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RZ — two low-friction non-contact elastomer seals, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 6300 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-RSR." } ], "cross_ref": [ { "equiv_sku": "61915-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61915-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61915-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61915-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916", "brand": "SKF", "manufacturer_designation": "SKF 61916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 80 mm of 61916 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61916 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61916 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61916-2Z (shields) and 61916-2RSH (contact seals), not suffix-free 61916.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916 bearing?", "a": "A 61916 deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61916 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916 need?", "a": "The open 61916 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61916?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916 — the open (unsealed) execution, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 7500 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61916-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61916-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61916-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61916-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS bearing?", "a": "A 61916-2RS deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 61916-2RS have?", "a": "Unless a clearance suffix says otherwise, 61916-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61916 and verify the residual clearance after mounting." }, { "q": "How should 61916-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61916-2RS need?", "a": "61916-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 61916-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 3400 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-2RS." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61916-2RZ.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 80 mm of 61916-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The low-drag lip of 61916-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 61916-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61916-RSR.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61916-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR bearing?", "a": "A 61916-RSR deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 61916-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61916 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61916 uses the same ISO 15 envelope (80×110×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 61916-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RZ — two low-friction non-contact elastomer seals, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 6000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-RSR." } ], "cross_ref": [ { "equiv_sku": "61916-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61916-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61916-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61917", "brand": "SKF", "manufacturer_designation": "SKF 61917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.9, "static_load_kN": 30, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61917 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 120 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61917 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61917 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61917 drags the lip and overheats it.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61917 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61917-2Z (shields) and 61917-2RSH (contact seals), not suffix-free 61917.", "The 31.9/30 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61917 bearing?", "a": "A 61917 deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61917 have?", "a": "Unless a clearance suffix says otherwise, 61917 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61917 and verify the residual clearance after mounting." }, { "q": "How should 61917 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61917 need?", "a": "The open 61917 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61917?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61917 — the open (unsealed) execution, 85×120×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 30 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61917." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61917-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61917-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61917-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61917-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61918", "brand": "SKF", "manufacturer_designation": "SKF 61918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 590, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61918 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918.", "The open 61918 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61918-2Z (shields) and 61918-2RSH (contact seals), not suffix-free 61918.", "The 33.2/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61918 bearing?", "a": "A 61918 deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61918 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61918 need?", "a": "The open 61918 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61918?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61918 — the open (unsealed) execution, 90×125×18 mm per ISO 15. Quoted values: C 33.2 kN, C0 31.5 kN, Pu 1.29 kN, limiting speed 6700 r/min, mass 590 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61918." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61918-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61918-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61918-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61918-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61918-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919", "brand": "SKF", "manufacturer_designation": "SKF 61919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61919 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 95 mm bore the ring mass is significant: heat 61919 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61919 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61919 drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61919 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61919-2Z (shields) and 61919-2RSH (contact seals), not suffix-free 61919.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919 bearing?", "a": "A 61919 deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61919 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61919 need?", "a": "The open 61919 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61919?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919 — the open (unsealed) execution, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 6300 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61919-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61919-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61919-2RS runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61919-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61919-2RS drags the lip and overheats it.", "SKF catalogues the contact-sealed version as 61919-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS bearing?", "a": "A 61919-2RS deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61919 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61919 uses the same ISO 15 envelope (95×130×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61919-2RS have?", "a": "Unless a clearance suffix says otherwise, 61919-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61919 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61919-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 3000 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919-2RS." } ], "cross_ref": [ { "equiv_sku": "61919-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61919-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61919-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61919-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61920", "brand": "SKF", "manufacturer_designation": "SKF 61920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 41.5, "fatigue_load_limit_kN": 1.63, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 830, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 100 mm bore the ring mass is significant: heat 61920 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 100 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61920 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61920 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61920.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61920 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61920-2Z (shields) and 61920-2RSH (contact seals), not suffix-free 61920.", "The 42.3/41.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61920 bearing?", "a": "A 61920 deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61920 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61920 uses the same ISO 15 envelope (100×140×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61920 have?", "a": "Unless a clearance suffix says otherwise, 61920 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting." }, { "q": "How should 61920 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61920?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61920 — the open (unsealed) execution, 100×140×20 mm per ISO 15. Quoted values: C 42.3 kN, C0 41.5 kN, Pu 1.63 kN, limiting speed 6000 r/min, mass 830 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61920." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61920-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61920-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61920-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61920-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61921", "brand": "SKF", "manufacturer_designation": "SKF 61921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44.2, "static_load_kN": 44, "fatigue_load_limit_kN": 1.7, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61921 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61921 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×145×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61921 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61921-2Z (shields) and 61921-2RSH (contact seals), not suffix-free 61921.", "The 44.2/44 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61921 bearing?", "a": "A 61921 deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61921 need?", "a": "The open 61921 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61921 mean?", "a": "A bare 61921 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61921?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61921 — the open (unsealed) execution, 105×145×20 mm per ISO 15. Quoted values: C 44.2 kN, C0 44 kN, Pu 1.7 kN, limiting speed 5600 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61921." } ], "cross_ref": [ { "equiv_sku": "61921-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61921-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61921-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61921-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61921-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61921-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61922", "brand": "SKF", "manufacturer_designation": "SKF 61922", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 43.6, "static_load_kN": 45, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61922 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61922 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61922.", "Never mix components between two 61922 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61922 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61922-2Z (shields) and 61922-2RSH (contact seals), not suffix-free 61922.", "The 43.6/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61922 bearing?", "a": "A 61922 deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61922 have?", "a": "Unless a clearance suffix says otherwise, 61922 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61922 and verify the residual clearance after mounting." }, { "q": "How should 61922 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61922 need?", "a": "The open 61922 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61922?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61922 — the open (unsealed) execution, 110×150×20 mm per ISO 15. Quoted values: C 43.6 kN, C0 45 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61922." } ], "cross_ref": [ { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61922-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61922-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61922-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61922-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61922-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61922 MA (machined brass cage, open arrangement) is the same-size execution on the 110×150×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61924", "brand": "SKF", "manufacturer_designation": "SKF 61924", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55.3, "static_load_kN": 57, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61924 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 61924 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61924 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×165×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Never mix components between two 61924 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61924 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61924-2Z (shields) and 61924-2RSH (contact seals), not suffix-free 61924.", "The 55.3/57 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61924 bearing?", "a": "A 61924 deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61924 need?", "a": "The open 61924 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61924 mean?", "a": "A bare 61924 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61924?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61924 — the open (unsealed) execution, 120×165×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 57 kN, Pu 2.04 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61924." } ], "cross_ref": [ { "equiv_sku": "61924-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61924-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61924-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61924 MA (machined brass cage, open arrangement) is the same-size execution on the 120×165×22 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61926", "brand": "SKF", "manufacturer_designation": "SKF 61926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 65, "static_load_kN": 67, "fatigue_load_limit_kN": 2.28, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61926 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 180 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61926 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×180×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61926 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61926-C3. No clearance suffix means normal CN clearance.", "The open 61926 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61926-2Z (shields) and 61926-2RSH (contact seals), not suffix-free 61926.", "The 65/67 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61926 bearing?", "a": "A 61926 deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61926 mean?", "a": "A bare 61926 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61926?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61926 — the open (unsealed) execution, 130×180×24 mm per ISO 15. Quoted values: C 65 kN, C0 67 kN, Pu 2.28 kN, limiting speed 4500 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61926." } ], "cross_ref": [ { "equiv_sku": "61926-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61926-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61926-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61926-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61928", "brand": "SKF", "manufacturer_designation": "SKF 61928", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.3, "static_load_kN": 72, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 61928 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61928 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 61928 drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61928 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61928-2Z (shields) and 61928-2RSH (contact seals), not suffix-free 61928.", "The 66.3/72 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61928 bearing?", "a": "A 61928 deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61928 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61928 have?", "a": "Unless a clearance suffix says otherwise, 61928 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 61928?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61928 — the open (unsealed) execution, 140×190×24 mm per ISO 15. Quoted values: C 66.3 kN, C0 72 kN, Pu 2.36 kN, limiting speed 4300 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61928." } ], "cross_ref": [ { "equiv_sku": "61928-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61928-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61928-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61928-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61928-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61928 MA (machined brass cage, open arrangement) is the same-size execution on the 140×190×24 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61932", "brand": "SKF", "manufacturer_designation": "SKF 61932", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92.3, "static_load_kN": 98, "fatigue_load_limit_kN": 3.05, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61932 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61932 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×220×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932.", "The open 61932 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61932-2Z (shields) and 61932-2RSH (contact seals), not suffix-free 61932.", "The 92.3/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61932 bearing?", "a": "A 61932 deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61932 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61932 need?", "a": "The open 61932 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61932?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61932 — the open (unsealed) execution, 160×220×28 mm per ISO 15. Quoted values: C 92.3 kN, C0 98 kN, Pu 3.05 kN, limiting speed 3800 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61932." } ], "cross_ref": [ { "equiv_sku": "61932-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61932-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61932-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61932-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61932-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×220×28 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61932-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61932 MA (machined brass cage, open arrangement) is the same-size execution on the 160×220×28 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61936", "brand": "SKF", "manufacturer_designation": "SKF 61936", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 119, "static_load_kN": 134, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Large bores like the 180 mm of 61936 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 180 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61936 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61936 units.", "Never mix components between two 61936 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61936.", "The open 61936 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61936-2Z (shields) and 61936-2RSH (contact seals), not suffix-free 61936.", "The 119/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61936 bearing?", "a": "A 61936 deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61936 mean?", "a": "A bare 61936 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "Are 61936 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61936 uses the same ISO 15 envelope (180×250×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 61936?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61936 — the open (unsealed) execution, 180×250×33 mm per ISO 15. Quoted values: C 119 kN, C0 134 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61936." } ], "cross_ref": [ { "equiv_sku": "61936-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61936-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61936-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61936-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×250×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61936-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61936 MA (machined brass cage, open arrangement) is the same-size execution on the 180×250×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61938", "brand": "SKF", "manufacturer_designation": "SKF 61938", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 134, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 190 mm of 61938 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 190 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61938 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "Never mix components between two 61938 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61938 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61938-2Z (shields) and 61938-2RSH (contact seals), not suffix-free 61938.", "The 117/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61938 bearing?", "a": "A 61938 deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61938 need?", "a": "The open 61938 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61938 bore code work?", "a": "The last two digits of 61938 are bore code 38, giving 38 × 5 = 190 mm bore. The 260 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61938 mean?", "a": "A bare 61938 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61938?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61938 — the open (unsealed) execution, 190×260×33 mm per ISO 15. Quoted values: C 117 kN, C0 134 kN, Pu 3.8 kN, limiting speed 3200 r/min, mass 4500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61938." } ], "cross_ref": [ { "equiv_sku": "61938-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 190×260×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61938-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61938-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61938-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61938 MA (machined brass cage, open arrangement) is the same-size execution on the 190×260×33 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61940", "brand": "SKF", "manufacturer_designation": "SKF 61940", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 148, "static_load_kN": 166, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61940 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 280 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 200 mm of 61940 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section at 200 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61940 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×280×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 61940 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61940.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61940 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61940-2Z (shields) and 61940-2RSH (contact seals), not suffix-free 61940.", "The 148/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61940 bearing?", "a": "A 61940 deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61940 have?", "a": "Unless a clearance suffix says otherwise, 61940 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61940 and verify the residual clearance after mounting." }, { "q": "How should 61940 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61940 need?", "a": "The open 61940 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 61940?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61940 — the open (unsealed) execution, 200×280×38 mm per ISO 15. Quoted values: C 148 kN, C0 166 kN, Pu 4.55 kN, limiting speed 3000 r/min, mass 6300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61940." } ], "cross_ref": [ { "equiv_sku": "61940-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61940-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61940-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61940-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×280×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61940-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61940 MA (machined brass cage, open arrangement) is the same-size execution on the 200×280×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61944", "brand": "SKF", "manufacturer_designation": "SKF 61944", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 180, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 6800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 61944 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 220 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61944 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61944 drags the lip and overheats it.", "Never mix components between two 61944 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61944 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61944-2Z (shields) and 61944-2RSH (contact seals), not suffix-free 61944.", "The 151/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61944 bearing?", "a": "A 61944 deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61944 need?", "a": "The open 61944 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61944 mean?", "a": "A bare 61944 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61944?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61944 — the open (unsealed) execution, 220×300×38 mm per ISO 15. Quoted values: C 151 kN, C0 180 kN, Pu 4.75 kN, limiting speed 2600 r/min, mass 6800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61944." } ], "cross_ref": [ { "equiv_sku": "61944-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61944-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61944-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61944-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×300×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61944-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61944 MA (machined brass cage, open arrangement) is the same-size execution on the 220×300×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61948", "brand": "SKF", "manufacturer_designation": "SKF 61948", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 159, "static_load_kN": 200, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61948 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 320 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section at 240 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61948 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61948 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61948.", "The open 61948 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61948-2Z (shields) and 61948-2RSH (contact seals), not suffix-free 61948.", "The 159/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61948 bearing?", "a": "A 61948 deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 61948 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61948 need?", "a": "The open 61948 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 61948?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61948 — the open (unsealed) execution, 240×320×38 mm per ISO 15. Quoted values: C 159 kN, C0 200 kN, Pu 5.1 kN, limiting speed 2400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61948." } ], "cross_ref": [ { "equiv_sku": "61948-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61948-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "61948-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61948-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 240×320×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61948-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61948 MA (machined brass cage, open arrangement) is the same-size execution on the 240×320×38 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61952", "brand": "SKF", "manufacturer_designation": "SKF 61952", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 270, "fatigue_load_limit_kN": 6.55, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 260 mm bore the ring mass is significant: heat 61952 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 260 mm bore (50.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61952 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 46 mm-wide ring of 61952 drags the lip and overheats it.", "The housing bore for the 360 mm OD should be round within IT7; an oval bore pinches the outer ring of 61952 and shows up later as two-point loaded raceway wear.", "The open 61952 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61952-2Z (shields) and 61952-2RSH (contact seals), not suffix-free 61952.", "The 212/270 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61952 bearing?", "a": "A 61952 deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61952 need?", "a": "The open 61952 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61952 mean?", "a": "A bare 61952 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61952?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61952 — the open (unsealed) execution, 260×360×46 mm per ISO 15. Quoted values: C 212 kN, C0 270 kN, Pu 6.55 kN, limiting speed 2200 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61952." } ], "cross_ref": [ { "equiv_sku": "61952-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×360×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61952-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61952 MA (machined brass cage, open arrangement) is the same-size execution on the 260×360×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61956", "brand": "SKF", "manufacturer_designation": "SKF 61956", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 216, "static_load_kN": 285, "fatigue_load_limit_kN": 6.7, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61956 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 56 by five gives the 280 mm bore; the 380 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 280 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 280 mm bore the ring mass is significant: heat 61956 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section (50.0 mm section height at 280 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61956 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Vibration during standstill brinells the raceways of a 280 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61956 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61956-2Z (shields) and 61956-2RSH (contact seals), not suffix-free 61956.", "The 216/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61956 bearing?", "a": "A 61956 deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61956 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61956 uses the same ISO 15 envelope (280×380×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61956 have?", "a": "Unless a clearance suffix says otherwise, 61956 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61956 and verify the residual clearance after mounting." }, { "q": "How should 61956 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 280 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 61956?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61956 — the open (unsealed) execution, 280×380×46 mm per ISO 15. Quoted values: C 216 kN, C0 285 kN, Pu 6.7 kN, limiting speed 2000 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61956." } ], "cross_ref": [ { "equiv_sku": "61956-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×380×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61956-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61956 MA (machined brass cage, open arrangement) is the same-size execution on the 280×380×46 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61960", "brand": "SKF", "manufacturer_designation": "SKF 61960", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 375, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 19000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61960 carries bore code 60 = 300 mm. Outside diameter 420 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 300 mm bore the ring mass is significant: heat 61960 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 300 mm bore (60.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "The open 61960 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×420×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61960-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 300 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61960.", "The open 61960 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61960-2Z (shields) and 61960-2RSH (contact seals), not suffix-free 61960.", "The 270/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61960 bearing?", "a": "A 61960 deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 61960 need?", "a": "The open 61960 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 61960 bore code work?", "a": "The last two digits of 61960 are bore code 60, giving 60 × 5 = 300 mm bore. The 420 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61960 mean?", "a": "A bare 61960 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 61960?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61960 — the open (unsealed) execution, 300×420×56 mm per ISO 15. Quoted values: C 270 kN, C0 375 kN, Pu 8.3 kN, limiting speed 1900 r/min, mass 19000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61960." } ], "cross_ref": [ { "equiv_sku": "61960-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 300×420×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "61960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "61960-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 61960 MA (machined brass cage, open arrangement) is the same-size execution on the 300×420×56 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6200-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6200-2RSL.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Codes 00–03 are the exception series: 6200 takes its 10 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6200-RSR run faster than contact-seal 6200-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6200-2RS instead.", "The non-contact lip of 6200-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6200-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-RSR bearing?", "a": "A 6200-RSR deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6200-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6200-RSR need?", "a": "6200-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6200 with a housing grease fitting instead." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6200-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSL — two low-friction non-contact elastomer seals, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-RSR." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7200", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2RS1 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200-2Z shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6200 shares the 10×30×9 mm envelope but rates differently (5.4/2.36 kN vs 4.36/2.32 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6201-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6201-2RSL.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Miniature bearings like 6201-RSR (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6201-RSR run faster than contact-seal 6201-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6201-2RS instead.", "The low-drag lip of 6201-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6201-RSR.", "SKF catalogues the low-friction seal as 6201-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-RSR bearing?", "a": "A 6201-RSR deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6201-RSR have?", "a": "Unless a clearance suffix says otherwise, 6201-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting." }, { "q": "How should 6201-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6201-RSR need?", "a": "6201-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6201 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6201-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSL — two low-friction non-contact elastomer seals, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-RSR." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7201", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2RS1 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201-2Z shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6201 shares the 12×32×10 mm envelope but rates differently (7.28/3.1 kN vs 5.72/3 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6202-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6202-2RSL.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Miniature bearings like 6202-RSR (15 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6202-RSR run faster than contact-seal 6202-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6202-2RS instead.", "The non-contact lip of 6202-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6202-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6202-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-RSR bearing?", "a": "A 6202-RSR deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6202-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSL — two low-friction non-contact elastomer seals, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-RSR." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7202", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2RS1 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202-2Z shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6202 shares the 15×35×11 mm envelope but rates differently (8.06/3.75 kN vs 6.37/3.6 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6203-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6203-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6203-RSR run faster than contact-seal 6203-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6203-2RS instead.", "The non-contact lip of 6203-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6203-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-RSR bearing?", "a": "A 6203-RSR deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How should 6203-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6203-RSR need?", "a": "6203-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6203 with a housing grease fitting instead." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the SKF designation and catalogue data for 6203-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSL — two low-friction non-contact elastomer seals, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-RSR." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7203", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2RS1 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203-2Z shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6203 shares the 17×40×12 mm envelope but rates differently (9.95/4.75 kN vs 8.06/4.75 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6204-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6204-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6204-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The low-drag lip of 6204-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6204-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6204-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6204-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-RSR bearing?", "a": "A 6204-RSR deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "Are 6204 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6204-RSR have?", "a": "Unless a clearance suffix says otherwise, 6204-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6204-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSL — two low-friction non-contact elastomer seals, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-RSR." } ], "cross_ref": [ { "equiv_sku": "6204-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6204-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6204-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6204-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2RS1 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204-2Z shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6204", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6204 shares the 20×47×14 mm envelope but rates differently (13.5/6.55 kN vs 10.8/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6205-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6205-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6205-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6205-RSR run faster than contact-seal 6205-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6205-2RS instead.", "The low-drag lip of 6205-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Never mix components between two 6205-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6205-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed, closer to the open bearing's 28000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-RSR bearing?", "a": "A 6205-RSR deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6205-RSR need?", "a": "6205-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6205 with a housing grease fitting instead." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6205-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6205-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSL — two low-friction non-contact elastomer seals, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-RSR." } ], "cross_ref": [ { "equiv_sku": "6205-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6205-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6205-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6205-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2RS1 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205-2Z shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6205", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6205 shares the 25×52×15 mm envelope but rates differently (14.8/7.8 kN vs 11.7/7.65 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6206-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6206-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6206-2RZ.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The low-drag lip of 6206-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6206-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6206-RSR.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6206-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-RSR bearing?", "a": "A 6206-RSR deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What does the RSR suffix on 6206-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "Are 6206 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6206 uses the same ISO 15 envelope (30×62×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6206-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RZ — two low-friction non-contact elastomer seals, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-RSR." } ], "cross_ref": [ { "equiv_sku": "6206-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6206-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6206-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2RS1 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206-2Z shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6206", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6206 shares the 30×62×16 mm envelope but rates differently (20.3/11.2 kN vs 16.5/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "206", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206 shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "206-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 206-2Z shares the 30×62×16 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6208-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6208-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6208-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "RSR low-friction seals on 6208-RSR run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.", "The low-drag lip of 6208-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the low-friction seal as 6208-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-RSR bearing?", "a": "A 6208-RSR deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6208-RSR have?", "a": "Unless a clearance suffix says otherwise, 6208-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6208 and verify the residual clearance after mounting." }, { "q": "How should 6208-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6208-RSR need?", "a": "6208-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6208 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6208-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RZ — two low-friction non-contact elastomer seals, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-RSR." } ], "cross_ref": [ { "equiv_sku": "6208-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6208-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6208-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6208-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2RS1 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208-2Z shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6208", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6208 shares the 40×80×18 mm envelope but rates differently (32.5/19 kN vs 25.1/17.6 kN) — not a load-rating equivalent." }, { "equiv_sku": "208", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208 shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "208-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224", "brand": "SKF", "manufacturer_designation": "SKF 6224", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 5250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 120 mm of 6224 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6224 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6224 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6224-2Z (shields) and 6224-2RSH (contact seals), not suffix-free 6224.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224 bearing?", "a": "A 6224 deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6224 mean?", "a": "A bare 6224 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6224?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224 — the open (unsealed) execution, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 4000 r/min, mass 5250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6224-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6224-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Large bores like the 120 mm of 6224-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6224-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6224-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6224-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6224-2RS.", "SKF catalogues the contact-sealed version as 6224-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1900 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6300 r/min thermal reference speed. The single-seal catalogue number is 6224-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6224-RS1 exists for arrangements that lubricate through the open side; fitting 6224-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS bearing?", "a": "A 6224-2RS deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6224-2RS have?", "a": "Unless a clearance suffix says otherwise, 6224-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6224-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 1900 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-2RS." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6224-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6224-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6224-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 120 mm of 6224-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6224-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.", "Do not wash 6224-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 6224-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-ZZ.", "SKF spells the shielded version 6224-2Z (one shield: 6224-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6224-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6224-2Z for high-contamination positions.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ bearing?", "a": "A 6224-ZZ deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6224-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "Are 6224 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6224-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2Z — two non-contact sheet-metal shields, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-ZZ." } ], "cross_ref": [ { "equiv_sku": "6224-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6224-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6224-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226", "brand": "SKF", "manufacturer_designation": "SKF 6226", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6226 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6226-C3. No clearance suffix means normal CN clearance.", "The open 6226 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6226-2Z (shields) and 6226-2RSH (contact seals), not suffix-free 6226.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226 bearing?", "a": "A 6226 deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226 — the open (unsealed) execution, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6226-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6226-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 6226-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Heat is the enemy of the sealed 6226-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6226-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6226-2RS.", "SKF catalogues the contact-sealed version as 6226-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6226-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6226-RS1 exists for arrangements that lubricate through the open side; fitting 6226-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS bearing?", "a": "A 6226-2RS deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6226-2RS be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6226-2RS need?", "a": "6226-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6226 with a housing grease fitting instead." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6226-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 1800 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-2RS." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6226-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6226-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 230 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6226-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Large bores like the 130 mm of 6226-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6226-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6226-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6226-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6226-2Z (one shield: 6226-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6226-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6226-2Z for high-contamination positions.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ bearing?", "a": "A 6226-ZZ deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6226 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6226 uses the same ISO 15 envelope (130×230×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6226-ZZ have?", "a": "Unless a clearance suffix says otherwise, 6226-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6226 and verify the residual clearance after mounting." }, { "q": "How should 6226-ZZ be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6226-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2Z — two non-contact sheet-metal shields, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3000 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-ZZ." } ], "cross_ref": [ { "equiv_sku": "6226-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6226-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6226-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6226 M (machined brass cage, open arrangement) is the same-size execution on the 130×230×40 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6228", "brand": "SKF", "manufacturer_designation": "SKF 6228", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 150, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 7750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6228 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 250 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 140 mm bore the ring mass is significant: heat 6228 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6228 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 42 mm-wide ring of 6228 drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6228-C3. No clearance suffix means normal CN clearance.", "The open 6228 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6228-2Z (shields) and 6228-2RSH (contact seals), not suffix-free 6228.", "The 165/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6228 bearing?", "a": "A 6228 deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "Are 6228 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6228 have?", "a": "Unless a clearance suffix says otherwise, 6228 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6228 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6228?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6228 — the open (unsealed) execution, 140×250×42 mm per ISO 15. Quoted values: C 165 kN, C0 150 kN, Pu 4.55 kN, limiting speed 3400 r/min, mass 7750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6228." } ], "cross_ref": [ { "equiv_sku": "6228-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6228-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6228-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6228-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6228-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6228-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6228-MA", "equiv_brand": "SKF", "level": "full", "note": "SKF 6228 MA (machined brass cage, open arrangement) is the same-size execution on the 140×250×42 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6230", "brand": "SKF", "manufacturer_designation": "SKF 6230", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 166, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "At 150 mm bore the 62xx light series is the workhorse section; its 270×45 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Storage matters for open bearings: 6230 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 45 mm-wide ring of 6230 drags the lip and overheats it.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6230-C3. No clearance suffix means normal CN clearance.", "The open 6230 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6230-2Z (shields) and 6230-2RSH (contact seals), not suffix-free 6230.", "The 174/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6230 bearing?", "a": "A 6230 deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "Are 6230 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6230 uses the same ISO 15 envelope (150×270×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6230 have?", "a": "Unless a clearance suffix says otherwise, 6230 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6230 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6230?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6230 — the open (unsealed) execution, 150×270×45 mm per ISO 15. Quoted values: C 174 kN, C0 166 kN, Pu 4.9 kN, limiting speed 3200 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6230." } ], "cross_ref": [ { "equiv_sku": "6230-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6230-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6230-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6230-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6230-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6230 M (machined brass cage, open arrangement) is the same-size execution on the 150×270×45 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6232", "brand": "SKF", "manufacturer_designation": "SKF 6232", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 13000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 160 mm of 6232 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6232 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6232 units.", "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6232.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6232 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6232-2Z (shields) and 6232-2RSH (contact seals), not suffix-free 6232.", "The 186/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6232 bearing?", "a": "A 6232 deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6232 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6232 have?", "a": "Unless a clearance suffix says otherwise, 6232 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6232 and verify the residual clearance after mounting." }, { "q": "How should 6232 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6232?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6232 — the open (unsealed) execution, 160×290×48 mm per ISO 15. Quoted values: C 186 kN, C0 186 kN, Pu 5.3 kN, limiting speed 3000 r/min, mass 13000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6232." } ], "cross_ref": [ { "equiv_sku": "6232-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6232-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6232-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6232-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6232 M (machined brass cage, open arrangement) is the same-size execution on the 160×290×48 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6234", "brand": "SKF", "manufacturer_designation": "SKF 6234", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 224, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 170 mm of 6234 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 170 mm bore the 62xx light series is the workhorse section; its 310×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6234 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6234 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The housing bore for the 310 mm OD should be round within IT7; an oval bore pinches the outer ring of 6234 and shows up later as two-point loaded raceway wear.", "The open 6234 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6234-2Z (shields) and 6234-2RSH (contact seals), not suffix-free 6234.", "The 212/224 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6234 bearing?", "a": "A 6234 deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "Are 6234 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6234 uses the same ISO 15 envelope (170×310×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6234 have?", "a": "Unless a clearance suffix says otherwise, 6234 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6234 and verify the residual clearance after mounting." }, { "q": "What is the SKF designation and catalogue data for 6234?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6234 — the open (unsealed) execution, 170×310×52 mm per ISO 15. Quoted values: C 212 kN, C0 224 kN, Pu 6.1 kN, limiting speed 2800 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6234." } ], "cross_ref": [ { "equiv_sku": "6234-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6234-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6234-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6234-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6234 M (machined brass cage, open arrangement) is the same-size execution on the 170×310×52 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6236", "brand": "SKF", "manufacturer_designation": "SKF 6236", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6236 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6236 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6236 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6236-2Z (shields) and 6236-2RSH (contact seals), not suffix-free 6236.", "The 229/240 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6236 bearing?", "a": "A 6236 deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6236 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6236 need?", "a": "The open 6236 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the SKF designation and catalogue data for 6236?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6236 — the open (unsealed) execution, 180×320×52 mm per ISO 15. Quoted values: C 229 kN, C0 240 kN, Pu 6.4 kN, limiting speed 2600 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6236." } ], "cross_ref": [ { "equiv_sku": "6236-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6236-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6236-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6236-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6236 M (machined brass cage, open arrangement) is the same-size execution on the 180×320×52 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6238", "brand": "SKF", "manufacturer_designation": "SKF 6238", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 280, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 19500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6238 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6238 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6238.", "The housing bore for the 340 mm OD should be round within IT7; an oval bore pinches the outer ring of 6238 and shows up later as two-point loaded raceway wear.", "The open 6238 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6238-2Z (shields) and 6238-2RSH (contact seals), not suffix-free 6238.", "The 255/280 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6238 bearing?", "a": "A 6238 deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6238 need?", "a": "The open 6238 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6238?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6238 — the open (unsealed) execution, 190×340×55 mm per ISO 15. Quoted values: C 255 kN, C0 280 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 19500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6238." } ], "cross_ref": [ { "equiv_sku": "6238-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6238-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6238-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6238-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6238 M (machined brass cage, open arrangement) is the same-size execution on the 190×340×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6240", "brand": "SKF", "manufacturer_designation": "SKF 6240", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 310, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 23500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6240 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 360 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 200 mm of 6240 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6240 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6240 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6240-2Z (shields) and 6240-2RSH (contact seals), not suffix-free 6240.", "The 270/310 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6240 bearing?", "a": "A 6240 deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 6240 have?", "a": "Unless a clearance suffix says otherwise, 6240 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6240 and verify the residual clearance after mounting." }, { "q": "How should 6240 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6240 need?", "a": "The open 6240 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the SKF designation and catalogue data for 6240?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6240 — the open (unsealed) execution, 200×360×58 mm per ISO 15. Quoted values: C 270 kN, C0 310 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 23500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6240." } ], "cross_ref": [ { "equiv_sku": "6240-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6240-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6240-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6240-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6240 M (machined brass cage, open arrangement) is the same-size execution on the 200×360×58 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6244", "brand": "SKF", "manufacturer_designation": "SKF 6244", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 296, "static_load_kN": 365, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 33500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6244 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 400 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 220 mm bore the ring mass is significant: heat 6244 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 220 mm bore; before upgrading to a 6344 for extra capacity, confirm the housing accepts a 400 mm OD and 65 mm width — it is not a drop-in swap.", "The open 6244 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Never mix components between two 6244 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6244 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6244-2Z (shields) and 6244-2RSH (contact seals), not suffix-free 6244.", "The 296/365 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6244 bearing?", "a": "A 6244 deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6244 bore code work?", "a": "The last two digits of 6244 are bore code 44, giving 44 × 5 = 220 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6244 mean?", "a": "A bare 6244 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 220 mm bore?", "a": "The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6244?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6244 — the open (unsealed) execution, 220×400×65 mm per ISO 15. Quoted values: C 296 kN, C0 365 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 33500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6244." } ], "cross_ref": [ { "equiv_sku": "6244-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6244-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6244-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6244 M (machined brass cage, open arrangement) is the same-size execution on the 220×400×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6300-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6300-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 00 comes from the 10/12/15/17 mm exception table, giving a 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6300-2RSL.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6200 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6300-RSR run faster than contact-seal 6300-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6300-2RS instead.", "The low-drag lip of 6300-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6300-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-RSR bearing?", "a": "A 6300-RSR deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6300-RSR have?", "a": "Unless a clearance suffix says otherwise, 6300-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6300 and verify the residual clearance after mounting." }, { "q": "How should 6300-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6300-RSR need?", "a": "6300-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6300 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6300-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSL — two low-friction non-contact elastomer seals, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-RSR." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2RS1 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300-2Z shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6300 shares the 10×35×11 mm envelope but rates differently (8.52/3.4 kN vs 7.02/3.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6301-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 01 comes from the 10/12/15/17 mm exception table, giving a 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6301-2RSL.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Miniature bearings like 6301-RSR (12 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "RSR low-friction seals on 6301-RSR run faster than contact-seal 6301-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6301-2RS instead.", "The low-drag lip of 6301-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6301-RSR drags the lip and overheats it.", "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6301-RSR.", "SKF catalogues the low-friction seal as 6301-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-RSR bearing?", "a": "A 6301-RSR deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6301 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6301 uses the same ISO 15 envelope (12×37×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6301-RSR have?", "a": "Unless a clearance suffix says otherwise, 6301-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6301 and verify the residual clearance after mounting." }, { "q": "How should 6301-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6301-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSL — two low-friction non-contact elastomer seals, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-RSR." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7301", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2RS1 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301-2Z shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6301 shares the 12×37×12 mm envelope but rates differently (10.1/4.15 kN vs 8.32/4.15 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6302-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6302-2RSL.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Codes 00–03 are the exception series: 6302 takes its 15 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "RSR low-friction seals on 6302-RSR run faster than contact-seal 6302-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6302-2RS instead.", "The non-contact lip of 6302-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6302-RSR and shows up later as two-point loaded raceway wear.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6302-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-RSR bearing?", "a": "A 6302-RSR deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6302-RSR have?", "a": "Unless a clearance suffix says otherwise, 6302-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6302 and verify the residual clearance after mounting." }, { "q": "How should 6302-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6302-RSR need?", "a": "6302-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6302-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSL — two low-friction non-contact elastomer seals, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-RSR." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7302", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2RS1 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302-2Z shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6302 shares the 15×42×13 mm envelope but rates differently (11.9/5.4 kN vs 9.95/5.4 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6303-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6303-2RSL.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Miniature bearings like 6303-RSR (17 mm bore) brinell under surprisingly small pressing force; use a fitting sleeve on the ring being mounted and never let the assembly load cross the balls.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6203 — do not specify it for speed-critical shafts.", "RSR low-friction seals on 6303-RSR run faster than contact-seal 6303-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6303-2RS instead.", "The non-contact lip of 6303-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6303-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6303-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 34000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-RSR bearing?", "a": "A 6303-RSR deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6303-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2RSL — two low-friction non-contact elastomer seals, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-RSR." } ], "cross_ref": [ { "equiv_sku": "6303-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2RS1 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303-2Z shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6303 shares the 17×47×14 mm envelope but rates differently (14.3/6.55 kN vs 11.7/6.55 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6304-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6304-2RSL.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "RSR low-friction seals on 6304-RSR run faster than contact-seal 6304-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6304-2RS instead.", "The non-contact lip of 6304-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6304-RSR drags the lip and overheats it.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6304-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 15.9/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-RSR bearing?", "a": "A 6304-RSR deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Are 6304 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6304-RSR have?", "a": "Unless a clearance suffix says otherwise, 6304-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting." }, { "q": "How should 6304-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6304-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSL — two low-friction non-contact elastomer seals, 20×52×15 mm per ISO 15. Quoted values: C 15.9 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-RSR." } ], "cross_ref": [ { "equiv_sku": "6304-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6304-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6304-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6304-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2RS1 shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304-2Z shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6304", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6304 shares the 20×52×15 mm envelope but rates differently (15.9/7.8 kN vs 13.8/7.8 kN) — not a load-rating equivalent." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6305-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6305-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6305-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305-RSR.", "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.", "The low-drag lip of 6305-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6305-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6305-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-RSR bearing?", "a": "A 6305-RSR deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6305-RSR need?", "a": "6305-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6305 with a housing grease fitting instead." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6305-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6305-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RZ — two low-friction non-contact elastomer seals, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-RSR." } ], "cross_ref": [ { "equiv_sku": "6305-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6305-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6305-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6305-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6305-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2RS1 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305-2Z shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6305", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6305 shares the 25×62×17 mm envelope but rates differently (23.4/11.6 kN vs 17.8/11.2 kN) — not a load-rating equivalent." }, { "equiv_sku": "305", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305 shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "305-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 305-2Z shares the 25×62×17 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6306-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6306-2RZ.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-RSR.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "RSR low-friction seals on 6306-RSR run faster than contact-seal 6306-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6306-2RS instead.", "The low-drag lip of 6306-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-C3. No clearance suffix means normal CN clearance.", "Never mix components between two 6306-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "SKF catalogues the low-friction seal as 6306-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-RSR bearing?", "a": "A 6306-RSR deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What lubrication does 6306-RSR need?", "a": "6306-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6306 with a housing grease fitting instead." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6306-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "What is the SKF designation and catalogue data for 6306-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RZ — two low-friction non-contact elastomer seals, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-RSR." } ], "cross_ref": [ { "equiv_sku": "6306-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6306-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6306-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "W6306-2RS", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2RS1 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306-2Z shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "W6306", "equiv_brand": "SKF", "level": "partial", "note": "SKF stainless execution W 6306 shares the 30×72×19 mm envelope but rates differently (29.6/16 kN vs 22.9/15 kN) — not a load-rating equivalent." }, { "equiv_sku": "306", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306 shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "306-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 306-2Z shares the 30×72×19 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6308-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 6308-2RZ.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The low-drag lip of 6308-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.", "The non-contact lip of 6308-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-RSR drags the lip and overheats it.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-RSR.", "SKF catalogues the low-friction seal as 6308-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-RSR bearing?", "a": "A 6308-RSR deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "What internal clearance does 6308-RSR have?", "a": "Unless a clearance suffix says otherwise, 6308-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6308 and verify the residual clearance after mounting." }, { "q": "How should 6308-RSR be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6308-RSR need?", "a": "6308-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6308 with a housing grease fitting instead." }, { "q": "What is the SKF designation and catalogue data for 6308-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RZ — two low-friction non-contact elastomer seals, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-RSR." } ], "cross_ref": [ { "equiv_sku": "6308-2RS-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-ZZ-FAG", "equiv_brand": "FAG", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6308-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6308-RSR-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6308-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "7308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "verify" }, { "equiv_sku": "308", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308 shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "308-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "SKF 308-2Z shares the 40×90×23 mm envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324", "brand": "SKF", "manufacturer_designation": "SKF 6324", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Large bores like the 120 mm of 6324 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Storage matters for open bearings: 6324 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6324 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6324 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6324-2Z (shields) and 6324-2RSH (contact seals), not suffix-free 6324.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324 bearing?", "a": "A 6324 deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324 — the open (unsealed) execution, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 3400 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6324-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6324-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Heat is the enemy of the sealed 6324-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6324-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324-2RS.", "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "SKF catalogues the contact-sealed version as 6324-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6324-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6324-RS1 exists for arrangements that lubricate through the open side; fitting 6324-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS bearing?", "a": "A 6324-2RS deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6324-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6324-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 1700 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-2RS." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6324-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6324-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6324-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "ZZ shields are non-contact: 6324-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6324-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6324-2Z (one shield: 6324-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6324-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6324-2Z for high-contamination positions.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ bearing?", "a": "A 6324-ZZ deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6324-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6324 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6324 uses the same ISO 15 envelope (120×260×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the SKF designation and catalogue data for 6324-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2Z — two non-contact sheet-metal shields, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 2800 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-ZZ." } ], "cross_ref": [ { "equiv_sku": "6324-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6324-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6324-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." }, { "equiv_sku": "6324-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6324 M (machined brass cage, open arrangement) is the same-size execution on the 120×260×55 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6326", "brand": "SKF", "manufacturer_designation": "SKF 6326", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 216, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 15000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "The open 6326 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6326-C3. No clearance suffix means normal CN clearance.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6326 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6326-2Z (shields) and 6326-2RSH (contact seals), not suffix-free 6326.", "The 229/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6326 bearing?", "a": "A 6326 deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6326 need?", "a": "The open 6326 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6326 mean?", "a": "A bare 6326 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6326?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6326 — the open (unsealed) execution, 130×280×58 mm per ISO 15. Quoted values: C 229 kN, C0 216 kN, Pu 6.3 kN, limiting speed 3200 r/min, mass 15000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6326." } ], "cross_ref": [ { "equiv_sku": "6326-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6326-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6326-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6326 M (machined brass cage, open arrangement) is the same-size execution on the 130×280×58 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6328", "brand": "SKF", "manufacturer_designation": "SKF 6328", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 245, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium section at 140 mm bore gains dynamic rating through larger rolling elements on a 300 mm OD; the penalty is mass and a lower limiting speed than the 6228 — do not specify it for speed-critical shafts.", "The open 6328 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6328 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6328-C3. No clearance suffix means normal CN clearance.", "The open 6328 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6328-2Z (shields) and 6328-2RSH (contact seals), not suffix-free 6328.", "The 251/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6328 bearing?", "a": "A 6328 deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6328 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6328 uses the same ISO 15 envelope (140×300×62 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6328 have?", "a": "Unless a clearance suffix says otherwise, 6328 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6328 and verify the residual clearance after mounting." }, { "q": "How should 6328 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6328?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6328 — the open (unsealed) execution, 140×300×62 mm per ISO 15. Quoted values: C 251 kN, C0 245 kN, Pu 7.1 kN, limiting speed 3000 r/min, mass 18500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6328." } ], "cross_ref": [ { "equiv_sku": "6328-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6328-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6328-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6328-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6328 M (machined brass cage, open arrangement) is the same-size execution on the 140×300×62 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6330", "brand": "SKF", "manufacturer_designation": "SKF 6330", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6330 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 150 mm bore the ring mass is significant: heat 6330 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 150 mm bore gains dynamic rating through larger rolling elements on a 320 mm OD; the penalty is mass and a lower limiting speed than the 6230 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6330 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6330 units.", "The housing bore for the 320 mm OD should be round within IT7; an oval bore pinches the outer ring of 6330 and shows up later as two-point loaded raceway wear.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6330 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6330-2Z (shields) and 6330-2RSH (contact seals), not suffix-free 6330.", "The 276/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6330 bearing?", "a": "A 6330 deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6330 mean?", "a": "A bare 6330 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6330?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6330 — the open (unsealed) execution, 150×320×65 mm per ISO 15. Quoted values: C 276 kN, C0 285 kN, Pu 7.8 kN, limiting speed 2800 r/min, mass 23000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6330." } ], "cross_ref": [ { "equiv_sku": "6330-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6330-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6330-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6330-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6330 M (machined brass cage, open arrangement) is the same-size execution on the 150×320×65 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6334", "brand": "SKF", "manufacturer_designation": "SKF 6334", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 312, "static_load_kN": 340, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 31000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6334 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 360 mm outside diameter and 72 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Large bores like the 170 mm of 6334 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "The open 6334 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×360×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6334 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6334-2Z (shields) and 6334-2RSH (contact seals), not suffix-free 6334.", "The 312/340 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6334 bearing?", "a": "A 6334 deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6334 need?", "a": "The open 6334 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6334 bore code work?", "a": "The last two digits of 6334 are bore code 34, giving 34 × 5 = 170 mm bore. The 360 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6334 mean?", "a": "A bare 6334 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6334?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6334 — the open (unsealed) execution, 170×360×72 mm per ISO 15. Quoted values: C 312 kN, C0 340 kN, Pu 8.8 kN, limiting speed 2400 r/min, mass 31000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6334." } ], "cross_ref": [ { "equiv_sku": "6334-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6334-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6334-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6334 M (machined brass cage, open arrangement) is the same-size execution on the 170×360×72 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6336", "brand": "SKF", "manufacturer_designation": "SKF 6336", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 351, "static_load_kN": 405, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 36500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6336 carries bore code 36 = 180 mm. Outside diameter 380 mm and width 75 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 180 mm bore the ring mass is significant: heat 6336 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6336 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6336-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 180 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6336.", "The open 6336 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6336-2Z (shields) and 6336-2RSH (contact seals), not suffix-free 6336.", "The 351/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6336 bearing?", "a": "A 6336 deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6336 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6336 uses the same ISO 15 envelope (180×380×75 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6336?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6336 — the open (unsealed) execution, 180×380×75 mm per ISO 15. Quoted values: C 351 kN, C0 405 kN, Pu 10.4 kN, limiting speed 2200 r/min, mass 36500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6336." } ], "cross_ref": [ { "equiv_sku": "6336-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6336-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6336-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6336 M (machined brass cage, open arrangement) is the same-size execution on the 180×380×75 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6338", "brand": "SKF", "manufacturer_designation": "SKF 6338", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 371, "static_load_kN": 430, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 42000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 190 mm of 6338 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 190 mm bore gains dynamic rating through larger rolling elements on a 400 mm OD; the penalty is mass and a lower limiting speed than the 6238 — do not specify it for speed-critical shafts.", "The open 6338 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6338 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6338-2Z (shields) and 6338-2RSH (contact seals), not suffix-free 6338.", "The 371/430 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6338 bearing?", "a": "A 6338 deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6338 need?", "a": "The open 6338 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the SKF designation and catalogue data for 6338?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6338 — the open (unsealed) execution, 190×400×78 mm per ISO 15. Quoted values: C 371 kN, C0 430 kN, Pu 10.8 kN, limiting speed 2200 r/min, mass 42000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6338." } ], "cross_ref": [ { "equiv_sku": "6338-NSK", "equiv_brand": "NSK", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6338-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "6338-M", "equiv_brand": "SKF", "level": "full", "note": "SKF 6338 M (machined brass cage, open arrangement) is the same-size execution on the 190×400×78 mm envelope with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6403", "brand": "SKF", "manufacturer_designation": "SKF 6403", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.455, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6403 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), its bore code 03 comes from the 10/12/15/17 mm exception table, giving a 17 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Codes 00–03 are the exception series: 6403 takes its 17 mm bore from the 10/12/15/17 mm table, so two designations only a few millimetres apart can read alike on paper — order by measured shaft size, not by code arithmetic.", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6403 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6403 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-C3. No clearance suffix means normal CN clearance.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6403.", "The open 6403 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6403-2Z (shields) and 6403-2RSH (contact seals), not suffix-free 6403.", "The 22.9/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6403 bearing?", "a": "A 6403 deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6403 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6403 have?", "a": "Unless a clearance suffix says otherwise, 6403 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6403 and verify the residual clearance after mounting." }, { "q": "How should 6403 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6403?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6403 — the open (unsealed) execution, 17×62×17 mm per ISO 15. Quoted values: C 22.9 kN, C0 10.8 kN, Pu 0.455 kN, limiting speed 18000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6403." } ], "cross_ref": [ { "equiv_sku": "6403-FAG", "equiv_brand": "FAG", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6403-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6403-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6403-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6415", "brand": "SKF", "manufacturer_designation": "SKF 6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 153, "static_load_kN": 114, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 5800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6415 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 190 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore exists for high radial load at moderate rpm; its 190 mm OD and 45 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6415 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×190×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6415 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "The housing bore for the 190 mm OD should be round within IT7; an oval bore pinches the outer ring of 6415 and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6415.", "The open 6415 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6415-2Z (shields) and 6415-2RSH (contact seals), not suffix-free 6415.", "The 153/114 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6415 bearing?", "a": "A 6415 deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6415 mean?", "a": "A bare 6415 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6415?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6415 — the open (unsealed) execution, 75×190×45 mm per ISO 15. Quoted values: C 153 kN, C0 114 kN, Pu 4.15 kN, limiting speed 5000 r/min, mass 5800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6415." } ], "cross_ref": [ { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6415-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6416", "brand": "SKF", "manufacturer_designation": "SKF 6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 163, "static_load_kN": 125, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 6850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6416 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6416.", "The open 6416 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6416-2Z (shields) and 6416-2RSH (contact seals), not suffix-free 6416.", "The 163/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6416 bearing?", "a": "A 6416 deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6416 have?", "a": "Unless a clearance suffix says otherwise, 6416 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6416 and verify the residual clearance after mounting." }, { "q": "How should 6416 be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the SKF designation and catalogue data for 6416?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6416 — the open (unsealed) execution, 80×200×48 mm per ISO 15. Quoted values: C 163 kN, C0 125 kN, Pu 4.5 kN, limiting speed 4800 r/min, mass 6850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6416." } ], "cross_ref": [ { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6416-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6417", "brand": "SKF", "manufacturer_designation": "SKF 6417", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 137, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 8050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore exists for high radial load at moderate rpm; its 210 mm OD and 52 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.", "The open 6417 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×210×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6417 units.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6400-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 6417 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6417-2Z (shields) and 6417-2RSH (contact seals), not suffix-free 6417.", "The 174/137 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6417 bearing?", "a": "A 6417 deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6417 mean?", "a": "A bare 6417 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6417?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6417 — the open (unsealed) execution, 85×210×52 mm per ISO 15. Quoted values: C 174 kN, C0 137 kN, Pu 4.75 kN, limiting speed 4500 r/min, mass 8050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6417." } ], "cross_ref": [ { "equiv_sku": "6417-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6417-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6418", "brand": "SKF", "manufacturer_designation": "SKF 6418", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 150, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 9800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6418 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 225 mm outside diameter and 54 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 90 mm of 6418 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Storage matters for open bearings: 6418 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6418 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 54 mm-wide ring of 6418 drags the lip and overheats it.", "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6418 and shows up later as two-point loaded raceway wear.", "The open 6418 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6418-2Z (shields) and 6418-2RSH (contact seals), not suffix-free 6418.", "The 186/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6418 bearing?", "a": "A 6418 deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6418 mean?", "a": "A bare 6418 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the SKF designation and catalogue data for 6418?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6418 — the open (unsealed) execution, 90×225×54 mm per ISO 15. Quoted values: C 186 kN, C0 150 kN, Pu 5 kN, limiting speed 4300 r/min, mass 9800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6418." } ], "cross_ref": [ { "equiv_sku": "6418-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6418-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7200", "brand": "SKF", "manufacturer_designation": "SKF 7200 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 7.02, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 10 mm shaft carrying combined load, SKF lists 7200 under catalogue execution 7200 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the light (7200) series of the 7xxx family.Digit by digit, 7200 reads as bearing type 7 (single-row angular contact), light section diameter series 2, and bore reference 00 resolving to 10 mm (codes 00-03 use the 10/12/15/17 mm exception table); 30 mm OD and 9 width are the matching ISO 15 boundary values. Suffix letters after 7200 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. Catalogue mass 30 g for the 10×30×9 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. A single 7200 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "encoder and resolver mountings", "instrument and rotary-table drives", "dental and laboratory high-speed rotors", "small machine-tool spindles and high-speed heads" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At a 10 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7200 shows up as spindle vibration long before it fails.", "The 72xx light section at 10 mm bore is the general-purpose angular-contact envelope (30×9 mm); stepping up to a 7300 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7200 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "At the 7.02 kN rating of 7200, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 30,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Open 7200 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 7.02/3.35 kN ratings are SKF catalogue 17000 values for the 7200 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7200 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7200 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7200 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7200?", "a": "The SKF 7200 BEP is a single-row angular-contact ball bearing with 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 7.02 kN, C0 3.35 kN, fatigue load limit Pu 0.14 kN, reference speed 30,000 r/min, limiting speed 30,000 r/min, mass about 30 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 30,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7200 bore code work?", "a": "The last two digits of 7200 are bore code 00, giving a 10 mm bore under the exception table. The 30 mm OD and 9 mm width come from the ISO 15 diameter-series plan, shared with the 6200 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7200 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7200 compare with a deep-groove 6200?", "a": "Both use the 10×30×9 mm ISO 15 envelope, but the angular-contact 7200 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7200 design to perform." } ], "cross_ref": [ { "equiv_sku": "7200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7200-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7200 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7200-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7200 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7200 BEP" ], "locale_variants": {} }, { "sku": "7201", "brand": "SKF", "manufacturer_designation": "SKF 7201 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 36, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 7.61, "static_load_kN": 3.8, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 28000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7201 (7201 BEP) is the light (7200) series angular-contact choice for a 12 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 32×10 mm ISO 15 envelope.Numbering ties the bearing to its envelope: 7201 means angular-contact type 7, light section section 2, 12 mm bore (codes 00-03 use the 10/12/15/17 mm exception table) — which is why the 32×10 mm outline swaps dimensionally with a 6201, though the load behaviour does not. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7201 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. At 28,000 r/min reference speed the 10.0 mm-section 7201 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 26,000 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7201 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 12 mm shaft positions.", "applications": [ "dental and laboratory high-speed rotors", "small machine-tool spindles and high-speed heads", "servo and stepper motor shafts", "textile and wire-guide spindles" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 12 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7201 shows up as spindle vibration long before it fails.", "The 72xx light section at 12 mm bore is the general-purpose angular-contact envelope (32×10 mm); stepping up to a 7301 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix execution classes inside one 7201 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7201 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 7.61/3.8 kN ratings are SKF catalogue 17000 values for the 7201 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7201 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7201 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7201 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7201?", "a": "The SKF 7201 BEP is a single-row angular-contact ball bearing with 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 7.61 kN, C0 3.8 kN, fatigue load limit Pu 0.16 kN, reference speed 28,000 r/min, limiting speed 26,000 r/min, mass about 36 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7201 bore code work?", "a": "The last two digits of 7201 are bore code 01, giving a 12 mm bore under the exception table. The 32 mm OD and 10 mm width come from the ISO 15 diameter-series plan, shared with the 6201 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7201 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7201 compare with a deep-groove 6201?", "a": "Both use the 12×32×10 mm ISO 15 envelope, but the angular-contact 7201 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6201 cannot be dropped into a combined-load 7201 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7201-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7201-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7201 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7201-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7201 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7201 BEP" ], "locale_variants": {} }, { "sku": "7202", "brand": "SKF", "manufacturer_designation": "SKF 7202 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 8.32, "static_load_kN": 4.4, "fatigue_load_limit_kN": 0.183, "reference_speed_rpm": 24000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7202 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 15 mm shaft, light (7200) series, with an open PA66-caged execution and one-direction axial capacity.On the SKF nameplate, 7202 follows the ISO numbering convention: 7 for the angular-contact type, 2 for the light section section, final digits 02 for the 15 mm bore (codes 00-03 use the 10/12/15/17 mm exception table). In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Speed planning uses two different ceilings: 24,000 r/min reference (thermal, under representative load) and 24,000 r/min limiting (mechanical cage/ball limit) — for this size the catalogue lists them at the same value. Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7202 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "servo and stepper motor shafts", "textile and wire-guide spindles", "small gear pumps and metering pumps", "encoder and resolver mountings" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At a 15 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7202 shows up as spindle vibration long before it fails.", "The 72xx light section at 15 mm bore is the general-purpose angular-contact envelope (35×11 mm); stepping up to a 7302 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7202 mounting error.", "Do not mix execution classes inside one 7202 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Catalogue reference speed and limiting speed are different limits: the 24,000 r/min reference is a thermal criterion under load, while the 24,000 r/min limiting value is the mechanical ceiling — observe both.", "The 8.32/4.4 kN ratings are SKF catalogue 17000 values for the 7202 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7202 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7202 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7202 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7202?", "a": "The SKF 7202 BEP is a single-row angular-contact ball bearing with 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 8.32 kN, C0 4.4 kN, fatigue load limit Pu 0.183 kN, reference speed 24,000 r/min, limiting speed 24,000 r/min, mass about 45 g. It is an open 40° contact-angle bearing with a PA66 cage. For this size the two values coincide, so either thermal or mechanical conditions set the same ceiling." }, { "q": "How does the 7202 bore code work?", "a": "The last two digits of 7202 are bore code 02, giving a 15 mm bore under the exception table. The 35 mm OD and 11 mm width come from the ISO 15 diameter-series plan, shared with the 6202 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7202 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7202 compare with a deep-groove 6202?", "a": "Both use the 15×35×11 mm ISO 15 envelope, but the angular-contact 7202 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 8.32 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7202-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7202 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7202-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7202 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7202-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7202 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7202-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7202 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-202-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 202 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7202 BEP" ], "locale_variants": {} }, { "sku": "7203", "brand": "SKF", "manufacturer_designation": "SKF 7203 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 65, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 10.4, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.236, "reference_speed_rpm": 22000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7203 is SKF's single-row angular-contact ball bearing in the light (7200) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7203 BEP in the SKF Rolling Bearings catalogue.The code breaks down as type prefix 7 (angular contact), diameter series 2 (the light section), and bore code 03 = 17 mm (codes 00-03 use the 10/12/15/17 mm exception table); dimensions 17×40×12 mm therefore match the 6203 deep-groove envelope even though the internal design is different. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). With C 10.4 kN and C0 5.5 kN, the 7203 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 20,000 r/min. Because the contact line runs at 40°, one 7203 reacts thrust in a single direction; bidirectional shafts need a DB or DF pair with defined preload, and a rotating inner ring on a 17 mm shaft typically takes a j5 seat with an H7 housing bore.", "applications": [ "small gear pumps and metering pumps", "encoder and resolver mountings", "instrument and rotary-table drives", "dental and laboratory high-speed rotors" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "brinelling from pressing the ring home through the balls or from static overload" ], "pitfalls": [ "At a 17 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7203 shows up as spindle vibration long before it fails.", "The 72xx light section at 17 mm bore is the general-purpose angular-contact envelope (40×12 mm); stepping up to a 7303 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7203 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7203 mounting error.", "The 7203 shares its ISO 15 envelope with deep-groove 6203 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 10.4/5.5 kN ratings are SKF catalogue 17000 values for the 7203 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7203 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7203 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7203 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7203?", "a": "The SKF 7203 BEP is a single-row angular-contact ball bearing with 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 10.4 kN, C0 5.5 kN, fatigue load limit Pu 0.236 kN, reference speed 22,000 r/min, limiting speed 20,000 r/min, mass about 65 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 22,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7203 bore code work?", "a": "The last two digits of 7203 are bore code 03, giving a 17 mm bore under the exception table. The 40 mm OD and 12 mm width come from the ISO 15 diameter-series plan, shared with the 6203 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7203 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7203 compare with a deep-groove 6203?", "a": "Both use the 17×40×12 mm ISO 15 envelope, but the angular-contact 7203 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7203 design to perform." } ], "cross_ref": [ { "equiv_sku": "7203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7203-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7203 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7203-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7203 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7203-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7203 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7203-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7203 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7203-BEY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7203 BEY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7203-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7203 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-203-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 203 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7203 BEP" ], "locale_variants": {} }, { "sku": "7204", "brand": "SKF", "manufacturer_designation": "SKF 7204 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 13.3, "static_load_kN": 7.65, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 19000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7204 BEP is a 20×47×14 mm single-row angular-contact ball bearing — the light (7200) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6204 deep-groove size but cut for combined radial and one-direction axial load.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 20 mm bore; the 47 mm OD and 14 mm width follow the ISO 15 general plan. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. The 0.325 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.58 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. For a 20 mm shaft the usual seat is k5 with an H7 housing when the inner ring rotates; arrange two 7204 bearings as a set for two-direction location and set preload from the load diagram, never from assembly feel.", "applications": [ "instrument and rotary-table drives", "dental and laboratory high-speed rotors", "small machine-tool spindles and high-speed heads", "servo and stepper motor shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7204 shows up as spindle vibration long before it fails.", "The 72xx light section at 20 mm bore is the general-purpose angular-contact envelope (47×14 mm); stepping up to a 7304 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Preload is a design value, not an assembly feel: excessive preload in the 7204 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7204 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 47 mm race release as noise within the first running hours.", "The 13.3/7.65 kN ratings are SKF catalogue 17000 values for the 7204 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7204 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7204 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7204 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7204?", "a": "The SKF 7204 BEP is a single-row angular-contact ball bearing with 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 13.3 kN, C0 7.65 kN, fatigue load limit Pu 0.325 kN, reference speed 19,000 r/min, limiting speed 18,000 r/min, mass about 110 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7204 bore code work?", "a": "The last two digits of 7204 are bore code 04, so 04 × 5 = 20 mm bore. The 47 mm OD and 14 mm width come from the ISO 15 diameter-series plan, shared with the 6204 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7204 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7204 compare with a deep-groove 6204?", "a": "Both use the 20×47×14 mm ISO 15 envelope, but the angular-contact 7204 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6204 cannot be dropped into a combined-load 7204 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7204-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7204 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7204-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7204 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7204 BEP" ], "locale_variants": {} }, { "sku": "7205", "brand": "SKF", "manufacturer_designation": "SKF 7205 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 14.8, "static_load_kN": 9.3, "fatigue_load_limit_kN": 0.4, "reference_speed_rpm": 16000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7205 appears as 7205 BEP: a 40° contact-angle, open, one-direction-thrust ball bearing in the light (7200) series, supplied with a glass-fibre PA66 cage as standard.Digit by digit, 7205 reads as bearing type 7 (single-row angular contact), light section diameter series 2, and bore reference 05 resolving to 25 mm; 52 mm OD and 15 width are the matching ISO 15 boundary values. Suffix letters after 7205 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. Selection arithmetic: the C0/C ratio is about 0.63 (static 9.3 kN against dynamic 14.8 kN), typical of a 40° angle sized for axial capacity, and the 0.4 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. Mounting practice for 7205: the rotating ring takes the interference fit (k5 on a 25 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "machine-tool spindles and spindle units", "servo drives and precision gearboxes", "gear pumps and screw-type pumps", "centrifugal and vacuum pumps" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "pre-grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 25 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7205 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 25 mm bore is the general-purpose angular-contact envelope (52×15 mm); stepping up to a 7305 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "A single 7205 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "Preload is a design value, not an assembly feel: excessive preload in the 7205 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 14.8/9.3 kN ratings are SKF catalogue 17000 values for the 7205 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7205 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7205 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7205 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7205?", "a": "The SKF 7205 BEP is a single-row angular-contact ball bearing with 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 14.8 kN, C0 9.3 kN, fatigue load limit Pu 0.4 kN, reference speed 16,000 r/min, limiting speed 15,000 r/min, mass about 130 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 15,000 r/min value is the one to design against." }, { "q": "How does the 7205 bore code work?", "a": "The last two digits of 7205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 diameter-series plan, shared with the 6205 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7205 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7205 compare with a deep-groove 6205?", "a": "Both use the 25×52×15 mm ISO 15 envelope, but the angular-contact 7205 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 14.8 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7205-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BEY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BEY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7205 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7205-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7205 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-205-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 205 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7205 BEP" ], "locale_variants": {} }, { "sku": "7206", "brand": "SKF", "manufacturer_designation": "SKF 7206 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 22.5, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.61, "reference_speed_rpm": 13000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7206 BEP belongs to SKF's universal single-row angular-contact range — the 30 mm bore entry in the light (7200) series, dimensioned 62 mm OD and 16 mm wide to the same ISO 15 boundary plan as the 6206 deep-groove envelope.Numbering ties the bearing to its envelope: 7206 means angular-contact type 7, light section section 2, 30 mm bore — which is why the 62×16 mm outline swaps dimensionally with a 6206, though the load behaviour does not. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7206 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 16.0 mm radial section height ((62−30)/2) and 200 g catalogue mass frame a 30 mm bore bearing rated at 22.5 kN C — roughly 0.75 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7206 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "gear pumps and screw-type pumps", "centrifugal and vacuum pumps", "automotive and industrial transmissions", "belt-driven fan and blower shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "mounting score marks when the bearing is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7206 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 30 mm bore is the general-purpose angular-contact envelope (62×16 mm); stepping up to a 7306 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 22.5 kN rating of 7206, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 13,000 r/min speed end and heavier preload only where moment stiffness dominates.", "A single 7206 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "The 200 g mass and 16 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7206.", "The 22.5/14.3 kN ratings are SKF catalogue 17000 values for the 7206 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7206 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7206 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7206 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7206?", "a": "The SKF 7206 BEP is a single-row angular-contact ball bearing with 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 22.5 kN, C0 14.3 kN, fatigue load limit Pu 0.61 kN, reference speed 13,000 r/min, limiting speed 13,000 r/min, mass about 200 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 13,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7206 bore code work?", "a": "The last two digits of 7206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 16 mm width come from the ISO 15 diameter-series plan, shared with the 6206 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7206 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7206 compare with a deep-groove 6206?", "a": "Both use the 30×62×16 mm ISO 15 envelope, but the angular-contact 7206 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7206 design to perform." } ], "cross_ref": [ { "equiv_sku": "7206-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7206-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7206 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7206-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7206 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7206-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7206 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7206-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7206 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7206-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7206 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7206-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7206 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7206-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7206 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-206-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 206 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-206-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 206 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7206 BEP" ], "locale_variants": {} }, { "sku": "7207", "brand": "SKF", "manufacturer_designation": "SKF 7207 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 29.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 11000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 35 mm shaft carrying combined load, SKF lists 7207 under catalogue execution 7207 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the light (7200) series of the 7xxx family.On the SKF nameplate, 7207 follows the ISO numbering convention: 7 for the angular-contact type, 2 for the light section section, final digits 07 for the 35 mm bore. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Catalogue mass 280 g for the 35×72×17 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. A single 7207 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "automotive and industrial transmissions", "belt-driven fan and blower shafts", "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7207 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 35 mm bore is the general-purpose angular-contact envelope (72×17 mm); stepping up to a 7307 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7207 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "At the 29.1 kN rating of 7207, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 11,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Open 7207 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 29.1/19 kN ratings are SKF catalogue 17000 values for the 7207 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7207 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7207 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7207 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7207?", "a": "The SKF 7207 BEP is a single-row angular-contact ball bearing with 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 29.1 kN, C0 19 kN, fatigue load limit Pu 0.815 kN, reference speed 11,000 r/min, limiting speed 11,000 r/min, mass about 280 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7207 bore code work?", "a": "The last two digits of 7207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 17 mm width come from the ISO 15 diameter-series plan, shared with the 6207 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7207 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7207 compare with a deep-groove 6207?", "a": "Both use the 35×72×17 mm ISO 15 envelope, but the angular-contact 7207 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6207 cannot be dropped into a combined-load 7207 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7207-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7207-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7207 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7207-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7207 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7207-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7207 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7207-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7207 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7207-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7207 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7207-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7207 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-207-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 207 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7207 BEP" ], "locale_variants": {} }, { "sku": "7208", "brand": "SKF", "manufacturer_designation": "SKF 7208 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 34.5, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 10000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7208 (7208 BEP) is the light (7200) series angular-contact choice for a 40 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 80×18 mm ISO 15 envelope.The code breaks down as type prefix 7 (angular contact), diameter series 2 (the light section), and bore code 08 = 40 mm; dimensions 40×80×18 mm therefore match the 6208 deep-groove envelope even though the internal design is different. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). At 10,000 r/min reference speed the 20.0 mm-section 7208 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 10,000 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7208 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 40 mm shaft positions.", "applications": [ "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units", "servo drives and precision gearboxes", "gear pumps and screw-type pumps" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "hard-particle indentation of the asymmetric raceway in unfiltered oil" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7208 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 40 mm bore is the general-purpose angular-contact envelope (80×18 mm); stepping up to a 7308 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix execution classes inside one 7208 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7208 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 34.5/24 kN ratings are SKF catalogue 17000 values for the 7208 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7208 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7208 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7208 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7208?", "a": "The SKF 7208 BEP is a single-row angular-contact ball bearing with 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 34.5 kN, C0 24 kN, fatigue load limit Pu 1.02 kN, reference speed 10,000 r/min, limiting speed 10,000 r/min, mass about 370 g. It is an open 40° contact-angle bearing with a PA66 cage. For this size the two values coincide, so either thermal or mechanical conditions set the same ceiling." }, { "q": "How does the 7208 bore code work?", "a": "The last two digits of 7208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 18 mm width come from the ISO 15 diameter-series plan, shared with the 6208 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7208 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7208 compare with a deep-groove 6208?", "a": "Both use the 40×80×18 mm ISO 15 envelope, but the angular-contact 7208 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 34.5 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7208-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7208 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7208-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7208 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7208-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7208 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7208-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7208 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7208-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7208 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7208-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7208 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7208-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7208 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-208-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 208 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7208 BEP" ], "locale_variants": {} }, { "sku": "7209", "brand": "SKF", "manufacturer_designation": "SKF 7209 BECBP", "series": "7200-series", "type": "angular_contact", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 38, "static_load_kN": 28.5, "fatigue_load_limit_kN": 1.22, "reference_speed_rpm": 9500, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7209 BECBP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 45 mm shaft, light (7200) series, with an open PA66-caged execution and one-direction axial capacity.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 45 mm bore; the 85 mm OD and 19 mm width follow the ISO 15 general plan. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. As a CB execution the rings are delivered match-ready: face-to-face or back-to-back pairs can be assembled without regrinding, and Normal (CB) clearance suits general preloaded pairs — GA/GB/GC suffixes would denote factory-set light/medium preload. Speed planning uses two different ceilings: 9,500 r/min reference (thermal, under representative load) and 10,000 r/min limiting (mechanical cage/ball limit). Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7209 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "servo drives and precision gearboxes", "gear pumps and screw-type pumps", "centrifugal and vacuum pumps", "automotive and industrial transmissions" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7209 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 45 mm bore is the general-purpose angular-contact envelope (85×19 mm); stepping up to a 7309 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7209 mounting error.", "Do not mix execution classes inside one 7209 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 10,000 r/min limiting value is the mechanical ceiling — observe both.", "The 38/28.5 kN ratings are SKF catalogue 17000 values for the 7209 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7209 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7209 BECBP designation when purchasing and match the execution to the mounting arrangement.", "The CB execution (7209 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7209?", "a": "The SKF 7209 BECBP is a single-row angular-contact ball bearing with 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 38 kN, C0 28.5 kN, fatigue load limit Pu 1.22 kN, reference speed 9,500 r/min, limiting speed 10,000 r/min, mass about 420 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 9,500 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7209 bore code work?", "a": "The last two digits of 7209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 19 mm width come from the ISO 15 diameter-series plan, shared with the 6209 deep-groove envelope." }, { "q": "What do the 72xx and BECBP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. CB adds Normal axial clearance with ground faces for universal DB/DF/DT pair mounting. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7209 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7209 compare with a deep-groove 6209?", "a": "Both use the 45×85×19 mm ISO 15 envelope, but the angular-contact 7209 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7209 design to perform." } ], "cross_ref": [ { "equiv_sku": "7209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7209-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7209 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7209-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7209 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7209-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7209 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7209-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7209 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7209-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7209 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7209-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7209 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-209-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 209 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7209 BECBP" ], "locale_variants": {} }, { "sku": "7210", "brand": "SKF", "manufacturer_designation": "SKF 7210 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 37.7, "static_load_kN": 28.5, "fatigue_load_limit_kN": 1.22, "reference_speed_rpm": 9000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7210 is SKF's single-row angular-contact ball bearing in the light (7200) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7210 BEP in the SKF Rolling Bearings catalogue.On the SKF nameplate, 7210 follows the ISO numbering convention: 7 for the angular-contact type, 2 for the light section section, final digits 10 for the 50 mm bore. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. The 1.22 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.76 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7210 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "belt-driven fan and blower shafts", "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units", "servo drives and precision gearboxes" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7210 pair heats, loses preload control and smears the raceways.", "The 72xx light section at 50 mm bore is the general-purpose angular-contact envelope (90×20 mm); stepping up to a 7310 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7210 mounting error.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7210 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 37.7/28.5 kN ratings are SKF catalogue 17000 values for the 7210 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7210 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7210 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7210 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7210?", "a": "The SKF 7210 BEP is a single-row angular-contact ball bearing with 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 37.7 kN, C0 28.5 kN, fatigue load limit Pu 1.22 kN, reference speed 9,000 r/min, limiting speed 8,500 r/min, mass about 470 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7210 bore code work?", "a": "The last two digits of 7210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 20 mm width come from the ISO 15 diameter-series plan, shared with the 6210 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7210 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7210 compare with a deep-groove 6210?", "a": "Both use the 50×90×20 mm ISO 15 envelope, but the angular-contact 7210 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6210 cannot be dropped into a combined-load 7210 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7210-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7210 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7210-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7210 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7210-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7210 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7210-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7210 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7210-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7210 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7210-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7210 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7210-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7210 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-210-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 210 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7210 BEP" ], "locale_variants": {} }, { "sku": "7211", "brand": "SKF", "manufacturer_designation": "SKF 7211 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 46.2, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 8000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7211 BEP is a 55×100×21 mm single-row angular-contact ball bearing — the light (7200) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6211 deep-groove size but cut for combined radial and one-direction axial load.The code breaks down as type prefix 7 (angular contact), diameter series 2 (the light section), and bore code 11 = 55 mm; dimensions 55×100×21 mm therefore match the 6211 deep-groove envelope even though the internal design is different. Suffix letters after 7211 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. Selection arithmetic: the C0/C ratio is about 0.78 (static 36 kN against dynamic 46.2 kN), typical of a 40° angle sized for axial capacity, and the 1.53 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. A single 7211 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives", "printing and paper-machine rolls" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "hard-particle indentation of the asymmetric raceway in unfiltered oil" ], "pitfalls": [ "Mount the 55 mm bore 7211 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 55 mm bore is the general-purpose angular-contact envelope (100×21 mm); stepping up to a 7311 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7211 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Do not mix execution classes inside one 7211 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "The 620 g mass and 21 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7211.", "The 46.2/36 kN ratings are SKF catalogue 17000 values for the 7211 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7211 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7211 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7211 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7211?", "a": "The SKF 7211 BEP is a single-row angular-contact ball bearing with 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 46.2 kN, C0 36 kN, fatigue load limit Pu 1.53 kN, reference speed 8,000 r/min, limiting speed 7,500 r/min, mass about 620 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 7,500 r/min value is the one to design against." }, { "q": "How does the 7211 bore code work?", "a": "The last two digits of 7211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 21 mm width come from the ISO 15 diameter-series plan, shared with the 6211 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7211 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7211 compare with a deep-groove 6211?", "a": "Both use the 55×100×21 mm ISO 15 envelope, but the angular-contact 7211 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 46.2 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7211-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7211 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7211-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7211 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7211-BECBP", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7211 BECBP shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7211-BECBPH", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7211 BECBPH shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7211-BECBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7211 BECBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7211-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7211 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7211-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7211 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-211-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 211 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-211-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 211 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7211 BEP" ], "locale_variants": {} }, { "sku": "7212", "brand": "SKF", "manufacturer_designation": "SKF 7212 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 800, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 57.2, "static_load_kN": 45.5, "fatigue_load_limit_kN": 1.93, "reference_speed_rpm": 7000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7212 appears as 7212 BEP: a 40° contact-angle, open, one-direction-thrust ball bearing in the light (7200) series, supplied with a glass-fibre PA66 cage as standard.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 60 mm bore; the 110 mm OD and 22 mm width follow the ISO 15 general plan. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7212 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 25.0 mm radial section height ((110−60)/2) and 800 g catalogue mass frame a 60 mm bore bearing rated at 57.2 kN C — roughly 0.95 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7212 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 60 mm shaft positions.", "applications": [ "process pump and compressor drives", "printing and paper-machine rolls", "crane sheave and hoist gearboxes", "agricultural and construction machinery drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 60 mm bore 7212 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 60 mm bore is the general-purpose angular-contact envelope (110×22 mm); stepping up to a 7312 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Preload is a design value, not an assembly feel: excessive preload in the 7212 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7212 mounting error.", "Open 7212 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 57.2/45.5 kN ratings are SKF catalogue 17000 values for the 7212 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7212 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7212 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7212 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7212?", "a": "The SKF 7212 BEP is a single-row angular-contact ball bearing with 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 57.2 kN, C0 45.5 kN, fatigue load limit Pu 1.93 kN, reference speed 7,000 r/min, limiting speed 7,000 r/min, mass about 800 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 7,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7212 bore code work?", "a": "The last two digits of 7212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 22 mm width come from the ISO 15 diameter-series plan, shared with the 6212 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7212 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7212 compare with a deep-groove 6212?", "a": "Both use the 60×110×22 mm ISO 15 envelope, but the angular-contact 7212 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7212 design to perform." } ], "cross_ref": [ { "equiv_sku": "7212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7212-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7212 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7212-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7212 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7212-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7212 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7212-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7212 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7212-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7212 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7212-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7212 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-212-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 212 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-212-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 212 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-212-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 212 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7212 BEP" ], "locale_variants": {} }, { "sku": "7213", "brand": "SKF", "manufacturer_designation": "SKF 7213 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 66.3, "static_load_kN": 54, "fatigue_load_limit_kN": 2.28, "reference_speed_rpm": 6700, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7213 BEP belongs to SKF's universal single-row angular-contact range — the 65 mm bore entry in the light (7200) series, dimensioned 120 mm OD and 23 mm wide to the same ISO 15 boundary plan as the 6213 deep-groove envelope.Digit by digit, 7213 reads as bearing type 7 (single-row angular contact), light section diameter series 2, and bore reference 13 resolving to 65 mm; 120 mm OD and 23 width are the matching ISO 15 boundary values. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Catalogue mass 1000 g for the 65×120×23 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7213 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "crane sheave and hoist gearboxes", "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 65 mm bore 7213 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 65 mm bore is the general-purpose angular-contact envelope (120×23 mm); stepping up to a 7313 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "A single 7213 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7213 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 66.3/54 kN ratings are SKF catalogue 17000 values for the 7213 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7213 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7213 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7213 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7213?", "a": "The SKF 7213 BEP is a single-row angular-contact ball bearing with 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 66.3 kN, C0 54 kN, fatigue load limit Pu 2.28 kN, reference speed 6,700 r/min, limiting speed 6,300 r/min, mass about 1000 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7213 bore code work?", "a": "The last two digits of 7213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 23 mm width come from the ISO 15 diameter-series plan, shared with the 6213 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7213 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7213 compare with a deep-groove 6213?", "a": "Both use the 65×120×23 mm ISO 15 envelope, but the angular-contact 7213 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6213 cannot be dropped into a combined-load 7213 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7213-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7213 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7213-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7213 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7213-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7213 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7213-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7213 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7213-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7213 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7213-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7213 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-213-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 213 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-213-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 213 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-213-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 213 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7213 BEP" ], "locale_variants": {} }, { "sku": "7214", "brand": "SKF", "manufacturer_designation": "SKF 7214 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 67.6, "static_load_kN": 56, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 70 mm shaft carrying combined load, SKF lists 7214 under catalogue execution 7214 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the light (7200) series of the 7xxx family.Numbering ties the bearing to its envelope: 7214 means angular-contact type 7, light section section 2, 70 mm bore — which is why the 125×24 mm outline swaps dimensionally with a 6214, though the load behaviour does not. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). At 6,300 r/min reference speed the 27.5 mm-section 7214 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 6,000 r/min as the mechanical ceiling. Because the contact line runs at 40°, one 7214 reacts thrust in a single direction; bidirectional shafts need a DB or DF pair with defined preload, and a rotating inner ring on a 70 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 70 mm bore 7214 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 70 mm bore is the general-purpose angular-contact envelope (125×24 mm); stepping up to a 7314 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 67.6 kN rating of 7214, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Preload is a design value, not an assembly feel: excessive preload in the 7214 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "Catalogue reference speed and limiting speed are different limits: the 6,300 r/min reference is a thermal criterion under load, while the 6,000 r/min limiting value is the mechanical ceiling — observe both.", "The 67.6/56 kN ratings are SKF catalogue 17000 values for the 7214 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7214 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7214 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7214 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7214?", "a": "The SKF 7214 BEP is a single-row angular-contact ball bearing with 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 67.6 kN, C0 56 kN, fatigue load limit Pu 2.36 kN, reference speed 6,300 r/min, limiting speed 6,000 r/min, mass about 1100 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 6,000 r/min value is the one to design against." }, { "q": "How does the 7214 bore code work?", "a": "The last two digits of 7214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 24 mm width come from the ISO 15 diameter-series plan, shared with the 6214 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7214 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7214 compare with a deep-groove 6214?", "a": "Both use the 70×125×24 mm ISO 15 envelope, but the angular-contact 7214 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 67.6 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7214-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7214 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7214-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7214 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7214-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7214 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7214-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7214 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7214-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7214 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7214-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7214 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-214-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 214 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-214-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 214 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-214-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 214 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7214 BEP" ], "locale_variants": {} }, { "sku": "7215", "brand": "SKF", "manufacturer_designation": "SKF 7215 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 70.2, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 6000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7215 (7215 BEP) is the light (7200) series angular-contact choice for a 75 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 130×25 mm ISO 15 envelope.On the SKF nameplate, 7215 follows the ISO numbering convention: 7 for the angular-contact type, 2 for the light section section, final digits 15 for the 75 mm bore. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. Speed planning uses two different ceilings: 6,000 r/min reference (thermal, under representative load) and 5,600 r/min limiting (mechanical cage/ball limit). For a 75 mm shaft the usual seat is k5 with an H7 housing when the inner ring rotates; arrange two 7215 bearings as a set for two-direction location and set preload from the load diagram, never from assembly feel.", "applications": [ "industrial gearboxes and speed reducers", "process pump and compressor drives", "printing and paper-machine rolls", "crane sheave and hoist gearboxes" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "brinelling from pressing the ring home through the balls or from static overload" ], "pitfalls": [ "Mount the 75 mm bore 7215 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 75 mm bore is the general-purpose angular-contact envelope (130×25 mm); stepping up to a 7315 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7215 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "A single 7215 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "The 7215 shares its ISO 15 envelope with deep-groove 6215 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 70.2/60 kN ratings are SKF catalogue 17000 values for the 7215 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7215 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7215 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7215 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7215?", "a": "The SKF 7215 BEP is a single-row angular-contact ball bearing with 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 70.2 kN, C0 60 kN, fatigue load limit Pu 2.5 kN, reference speed 6,000 r/min, limiting speed 5,600 r/min, mass about 1200 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 6,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7215 bore code work?", "a": "The last two digits of 7215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 25 mm width come from the ISO 15 diameter-series plan, shared with the 6215 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7215 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7215 compare with a deep-groove 6215?", "a": "Both use the 75×130×25 mm ISO 15 envelope, but the angular-contact 7215 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7215 design to perform." } ], "cross_ref": [ { "equiv_sku": "7215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7215-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7215 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7215-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7215 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7215-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7215 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7215-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7215 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7215-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7215 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-215-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 215 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-215-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 215 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-215-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 215 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7215 BEP" ], "locale_variants": {} }, { "sku": "7216", "brand": "SKF", "manufacturer_designation": "SKF 7216 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1450, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 80.6, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 5600, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7216 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 80 mm shaft, light (7200) series, with an open PA66-caged execution and one-direction axial capacity.The code breaks down as type prefix 7 (angular contact), diameter series 2 (the light section), and bore code 16 = 80 mm; dimensions 80×140×26 mm therefore match the 6216 deep-groove envelope even though the internal design is different. Suffix letters after 7216 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. With C 80.6 kN and C0 69.5 kN, the 7216 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 5,300 r/min. Mounting practice for 7216: the rotating ring takes the interference fit (k5 on a 80 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "printing and paper-machine rolls", "crane sheave and hoist gearboxes", "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 80 mm bore 7216 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 80 mm bore is the general-purpose angular-contact envelope (140×26 mm); stepping up to a 7316 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix execution classes inside one 7216 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "At the 80.6 kN rating of 7216, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 140 mm race release as noise within the first running hours.", "The 80.6/69.5 kN ratings are SKF catalogue 17000 values for the 7216 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7216 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7216 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7216 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7216?", "a": "The SKF 7216 BEP is a single-row angular-contact ball bearing with 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 80.6 kN, C0 69.5 kN, fatigue load limit Pu 2.8 kN, reference speed 5,600 r/min, limiting speed 5,300 r/min, mass about 1450 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7216 bore code work?", "a": "The last two digits of 7216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 26 mm width come from the ISO 15 diameter-series plan, shared with the 6216 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7216 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7216 compare with a deep-groove 6216?", "a": "Both use the 80×140×26 mm ISO 15 envelope, but the angular-contact 7216 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6216 cannot be dropped into a combined-load 7216 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7216-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7216-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7216-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7216-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7216-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7216-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7216 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-216-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 216 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-216-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 216 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7216 BEP" ], "locale_variants": {} }, { "sku": "7217", "brand": "SKF", "manufacturer_designation": "SKF 7217 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1850, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 95.6, "static_load_kN": 83, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7217 is SKF's single-row angular-contact ball bearing in the light (7200) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7217 BEP in the SKF Rolling Bearings catalogue.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 85 mm bore; the 150 mm OD and 28 mm width follow the ISO 15 general plan. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7217 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 3.25 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.87 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7217 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles", "industrial gearboxes and speed reducers" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "pre-grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 85 mm bore 7217 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 85 mm bore is the general-purpose angular-contact envelope (150×28 mm); stepping up to a 7317 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7217 mounting error.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7217 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 95.6/83 kN ratings are SKF catalogue 17000 values for the 7217 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7217 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7217 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7217 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7217?", "a": "The SKF 7217 BEP is a single-row angular-contact ball bearing with 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 95.6 kN, C0 83 kN, fatigue load limit Pu 3.25 kN, reference speed 5,300 r/min, limiting speed 5,000 r/min, mass about 1850 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 5,000 r/min value is the one to design against." }, { "q": "How does the 7217 bore code work?", "a": "The last two digits of 7217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 28 mm width come from the ISO 15 diameter-series plan, shared with the 6217 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7217 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7217 compare with a deep-groove 6217?", "a": "Both use the 85×150×28 mm ISO 15 envelope, but the angular-contact 7217 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 95.6 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7217-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7217 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7217-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7217 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7217-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7217 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7217-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7217 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-217-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 217 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-217-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 217 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7217 BEP" ], "locale_variants": {} }, { "sku": "7218", "brand": "SKF", "manufacturer_designation": "SKF 7218 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 108, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 5000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7218 BEP is a 90×160×30 mm single-row angular-contact ball bearing — the light (7200) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6218 deep-groove size but cut for combined radial and one-direction axial load.Digit by digit, 7218 reads as bearing type 7 (single-row angular contact), light section diameter series 2, and bore reference 18 resolving to 90 mm; 160 mm OD and 30 width are the matching ISO 15 boundary values. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Selection arithmetic: the C0/C ratio is about 0.89 (static 96.5 kN against dynamic 108 kN), typical of a 40° angle sized for axial capacity, and the 3.65 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. A single 7218 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives", "printing and paper-machine rolls" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "mounting score marks when the bearing is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 90 mm bore 7218 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 72xx light section at 90 mm bore is the general-purpose angular-contact envelope (160×30 mm); stepping up to a 7318 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7218 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Do not mix execution classes inside one 7218 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "The 2300 g mass and 30 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7218.", "The 108/96.5 kN ratings are SKF catalogue 17000 values for the 7218 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7218 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7218 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7218 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7218?", "a": "The SKF 7218 BEP is a single-row angular-contact ball bearing with 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 108 kN, C0 96.5 kN, fatigue load limit Pu 3.65 kN, reference speed 5,000 r/min, limiting speed 4,500 r/min, mass about 2300 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 5,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7218 bore code work?", "a": "The last two digits of 7218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 30 mm width come from the ISO 15 diameter-series plan, shared with the 6218 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7218 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7218 compare with a deep-groove 6218?", "a": "Both use the 90×160×30 mm ISO 15 envelope, but the angular-contact 7218 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7218 design to perform." } ], "cross_ref": [ { "equiv_sku": "7218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7218-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7218 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7218-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7218 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7218-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7218 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7218-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7218 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-218-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 218 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7218 BEP" ], "locale_variants": {} }, { "sku": "7219", "brand": "SKF", "manufacturer_designation": "SKF 7219 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 124, "static_load_kN": 108, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 4500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7219 appears as 7219 BEP: a 40° contact-angle, open, one-direction-thrust ball bearing in the light (7200) series, supplied with a glass-fibre PA66 cage as standard.Numbering ties the bearing to its envelope: 7219 means angular-contact type 7, light section section 2, 95 mm bore — which is why the 170×32 mm outline swaps dimensionally with a 6219, though the load behaviour does not. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). The 37.5 mm radial section height ((170−95)/2) and 2700 g catalogue mass frame a 95 mm bore bearing rated at 124 kN C — roughly 1.31 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7219 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 95 mm shaft positions.", "applications": [ "marine propulsion and deck machinery", "wind-turbine gearbox shafts", "rolling-mill auxiliary drives", "mineral-processing and crusher drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "At 95 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 72xx light section at 95 mm bore is the general-purpose angular-contact envelope (170×32 mm); stepping up to a 7319 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Preload is a design value, not an assembly feel: excessive preload in the 7219 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7219 mounting error.", "Open 7219 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 124/108 kN ratings are SKF catalogue 17000 values for the 7219 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7219 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7219 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7219 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7219?", "a": "The SKF 7219 BEP is a single-row angular-contact ball bearing with 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 124 kN, C0 108 kN, fatigue load limit Pu 4 kN, reference speed 4,500 r/min, limiting speed 4,300 r/min, mass about 2700 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7219 bore code work?", "a": "The last two digits of 7219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 32 mm width come from the ISO 15 diameter-series plan, shared with the 6219 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7219 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7219 compare with a deep-groove 6219?", "a": "Both use the 95×170×32 mm ISO 15 envelope, but the angular-contact 7219 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6219 cannot be dropped into a combined-load 7219 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7219-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7219 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7219-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7219 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7219-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7219 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7219-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7219 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7219-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7219 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-219-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 219 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7219 BEP" ], "locale_variants": {} }, { "sku": "7220", "brand": "SKF", "manufacturer_designation": "SKF 7220 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 135, "static_load_kN": 122, "fatigue_load_limit_kN": 4.4, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7220 BEP belongs to SKF's universal single-row angular-contact range — the 100 mm bore entry in the light (7200) series, dimensioned 180 mm OD and 34 mm wide to the same ISO 15 boundary plan as the 6220 deep-groove envelope.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 2 is ISO diameter series 2 (light section), and the last two digits encode the 100 mm bore; the 180 mm OD and 34 mm width follow the ISO 15 general plan. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). At 4,300 r/min reference speed the 40.0 mm-section 7220 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 4,000 r/min as the mechanical ceiling. Mounting practice for 7220: the rotating ring takes the interference fit (k5 on a 100 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "large mud pumps and offshore winch drums", "heavy industrial gearboxes", "large process pumps and compressors", "marine propulsion and deck machinery" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "pre-grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "At 100 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 72xx light section at 100 mm bore is the general-purpose angular-contact envelope (180×34 mm); stepping up to a 7320 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Preload is a design value, not an assembly feel: excessive preload in the 7220 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "Do not mix execution classes inside one 7220 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "The 7220 shares its ISO 15 envelope with deep-groove 6220 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 135/122 kN ratings are SKF catalogue 17000 values for the 7220 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7220 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7220 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7220 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7220?", "a": "The SKF 7220 BEP is a single-row angular-contact ball bearing with 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 135 kN, C0 122 kN, fatigue load limit Pu 4.4 kN, reference speed 4,300 r/min, limiting speed 4,000 r/min, mass about 3300 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 4,000 r/min value is the one to design against." }, { "q": "How does the 7220 bore code work?", "a": "The last two digits of 7220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 34 mm width come from the ISO 15 diameter-series plan, shared with the 6220 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7220 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7220 compare with a deep-groove 6220?", "a": "Both use the 100×180×34 mm ISO 15 envelope, but the angular-contact 7220 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 135 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7220-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7220 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7220-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7220 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7220-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7220 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7220-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7220 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-220-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 220 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7220 BEP" ], "locale_variants": {} }, { "sku": "7221", "brand": "SKF", "manufacturer_designation": "SKF 7221 BECBP", "series": "7200-series", "type": "angular_contact", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 3950, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 156, "static_load_kN": 150, "fatigue_load_limit_kN": 5.2, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 105 mm shaft carrying combined load, SKF lists 7221 under catalogue execution 7221 BECBP: one open single-row angular-contact ball bearing, 40° contact angle, in the light (7200) series of the 7xxx family.Digit by digit, 7221 reads as bearing type 7 (single-row angular contact), light section diameter series 2, and bore reference 21 resolving to 105 mm; 190 mm OD and 36 width are the matching ISO 15 boundary values. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. As a CB execution the rings are delivered match-ready: face-to-face or back-to-back pairs can be assembled without regrinding, and Normal (CB) clearance suits general preloaded pairs — GA/GB/GC suffixes would denote factory-set light/medium preload. Speed planning uses two different ceilings: 4,000 r/min reference (thermal, under representative load) and 4,300 r/min limiting (mechanical cage/ball limit). Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7221 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "large process pumps and compressors", "marine propulsion and deck machinery", "wind-turbine gearbox shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "mounting score marks when the bearing is cocked over the shaft keyway or a burr" ], "pitfalls": [ "At 105 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 72xx light section at 105 mm bore is the general-purpose angular-contact envelope (190×36 mm); stepping up to a 7321 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "A single 7221 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7221 mounting error.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 190 mm race release as noise within the first running hours.", "The 156/150 kN ratings are SKF catalogue 17000 values for the 7221 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7221 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7221 BECBP designation when purchasing and match the execution to the mounting arrangement.", "The CB execution (7221 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7221?", "a": "The SKF 7221 BECBP is a single-row angular-contact ball bearing with 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 156 kN, C0 150 kN, fatigue load limit Pu 5.2 kN, reference speed 4,000 r/min, limiting speed 4,300 r/min, mass about 3950 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 4,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7221 bore code work?", "a": "The last two digits of 7221 are bore code 21, so 21 × 5 = 105 mm bore. The 190 mm OD and 36 mm width come from the ISO 15 diameter-series plan, shared with the 6221 deep-groove envelope." }, { "q": "What do the 72xx and BECBP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. CB adds Normal axial clearance with ground faces for universal DB/DF/DT pair mounting. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7221 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7221 compare with a deep-groove 6221?", "a": "Both use the 105×190×36 mm ISO 15 envelope, but the angular-contact 7221 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7221 design to perform." } ], "cross_ref": [ { "equiv_sku": "7221-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7221-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7221 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7221-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7221 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7221 BECBP" ], "locale_variants": {} }, { "sku": "7222", "brand": "SKF", "manufacturer_designation": "SKF 7222 BEP", "series": "7200-series", "type": "angular_contact", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 153, "static_load_kN": 143, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7222 (7222 BEP) is the light (7200) series angular-contact choice for a 110 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 200×38 mm ISO 15 envelope.Numbering ties the bearing to its envelope: 7222 means angular-contact type 7, light section section 2, 110 mm bore — which is why the 200×38 mm outline swaps dimensionally with a 6222, though the load behaviour does not. Suffix letters after 7222 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. With C 153 kN and C0 143 kN, the 7222 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,600 r/min. A single 7222 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "wind-turbine gearbox shafts", "rolling-mill auxiliary drives", "mineral-processing and crusher drives", "large mud pumps and offshore winch drums" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "At 110 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 72xx light section at 110 mm bore is the general-purpose angular-contact envelope (200×38 mm); stepping up to a 7322 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 153 kN rating of 7222, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,600 r/min speed end and heavier preload only where moment stiffness dominates.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7222 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 153/143 kN ratings are SKF catalogue 17000 values for the 7222 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7222 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7222 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7222 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7222?", "a": "The SKF 7222 BEP is a single-row angular-contact ball bearing with 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 153 kN, C0 143 kN, fatigue load limit Pu 4.9 kN, reference speed 4,000 r/min, limiting speed 3,600 r/min, mass about 4600 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7222 bore code work?", "a": "The last two digits of 7222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 38 mm width come from the ISO 15 diameter-series plan, shared with the 6222 deep-groove envelope." }, { "q": "What do the 72xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 2 is the ISO diameter series (light section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7222 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7222 compare with a deep-groove 6222?", "a": "Both use the 110×200×38 mm ISO 15 envelope, but the angular-contact 7222 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6222 cannot be dropped into a combined-load 7222 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7222-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7222-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7222 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7222-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7222 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7222-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7222 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7222-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7222 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-222-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 222 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7222 BEP" ], "locale_variants": {} }, { "sku": "7301", "brand": "SKF", "manufacturer_designation": "SKF 7301 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 10.6, "static_load_kN": 5, "fatigue_load_limit_kN": 0.208, "reference_speed_rpm": 26000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7301 is SKF's single-row angular-contact ball bearing in the medium (7300) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7301 BEP in the SKF Rolling Bearings catalogue.Digit by digit, 7301 reads as bearing type 7 (single-row angular contact), medium section diameter series 3, and bore reference 01 resolving to 12 mm (codes 00-03 use the 10/12/15/17 mm exception table); 37 mm OD and 12 width are the matching ISO 15 boundary values. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. The 0.208 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.47 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7301 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 12 mm shaft positions.", "applications": [ "instrument and rotary-table drives", "dental and laboratory high-speed rotors", "small machine-tool spindles and high-speed heads", "servo and stepper motor shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "pre-grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "At a 12 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7301 shows up as spindle vibration long before it fails.", "The 73xx medium section at 12 mm bore (37×12 mm) is heavier-rated than the 7201 but runs hotter at the same speed; do not substitute a 7301 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "A single 7301 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "Do not mix execution classes inside one 7301 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 37 mm race release as noise within the first running hours.", "The 10.6/5 kN ratings are SKF catalogue 17000 values for the 7301 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7301 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7301 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7301 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7301?", "a": "The SKF 7301 BEP is a single-row angular-contact ball bearing with 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 10.6 kN, C0 5 kN, fatigue load limit Pu 0.208 kN, reference speed 26,000 r/min, limiting speed 24,000 r/min, mass about 60 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 24,000 r/min value is the one to design against." }, { "q": "How does the 7301 bore code work?", "a": "The last two digits of 7301 are bore code 01, giving a 12 mm bore under the exception table. The 37 mm OD and 12 mm width come from the ISO 15 diameter-series plan, shared with the 6301 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7301 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7301 compare with a deep-groove 6301?", "a": "Both use the 12×37×12 mm ISO 15 envelope, but the angular-contact 7301 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 10.6 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7301-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7301 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7301-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7301 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7301 BEP" ], "locale_variants": {} }, { "sku": "7302", "brand": "SKF", "manufacturer_designation": "SKF 7302 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 13, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 22000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7302 BEP is a 15×42×13 mm single-row angular-contact ball bearing — the medium (7300) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6302 deep-groove size but cut for combined radial and one-direction axial load.Numbering ties the bearing to its envelope: 7302 means angular-contact type 7, medium section section 3, 15 mm bore (codes 00-03 use the 10/12/15/17 mm exception table) — which is why the 42×13 mm outline swaps dimensionally with a 6302, though the load behaviour does not. Suffix letters after 7302 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. Selection arithmetic: the C0/C ratio is about 0.52 (static 6.7 kN against dynamic 13 kN), typical of a 40° angle sized for axial capacity, and the 0.28 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7302 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "small machine-tool spindles and high-speed heads", "servo and stepper motor shafts", "textile and wire-guide spindles", "small gear pumps and metering pumps" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "mounting score marks when the bearing is cocked over the shaft keyway or a burr" ], "pitfalls": [ "At a 15 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7302 shows up as spindle vibration long before it fails.", "The 73xx medium section at 15 mm bore (42×13 mm) is heavier-rated than the 7202 but runs hotter at the same speed; do not substitute a 7302 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "At the 13 kN rating of 7302, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 20,000 r/min speed end and heavier preload only where moment stiffness dominates.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7302 mounting error.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 13/6.7 kN ratings are SKF catalogue 17000 values for the 7302 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7302 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7302 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7302 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7302?", "a": "The SKF 7302 BEP is a single-row angular-contact ball bearing with 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 13 kN, C0 6.7 kN, fatigue load limit Pu 0.28 kN, reference speed 22,000 r/min, limiting speed 20,000 r/min, mass about 80 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 22,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7302 bore code work?", "a": "The last two digits of 7302 are bore code 02, giving a 15 mm bore under the exception table. The 42 mm OD and 13 mm width come from the ISO 15 diameter-series plan, shared with the 6302 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7302 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7302 compare with a deep-groove 6302?", "a": "Both use the 15×42×13 mm ISO 15 envelope, but the angular-contact 7302 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7302 design to perform." } ], "cross_ref": [ { "equiv_sku": "7302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7302-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7302 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7302-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7302 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7302-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7302 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7302 BEP" ], "locale_variants": {} }, { "sku": "7303", "brand": "SKF", "manufacturer_designation": "SKF 7303 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 15.9, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 20000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7303 appears as 7303 BEP: a 40° contact-angle, open, one-direction-thrust ball bearing in the medium (7300) series, supplied with a glass-fibre PA66 cage as standard.On the SKF nameplate, 7303 follows the ISO numbering convention: 7 for the angular-contact type, 3 for the medium section section, final digits 03 for the 17 mm bore (codes 00-03 use the 10/12/15/17 mm exception table). The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7303 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 15.0 mm radial section height ((47−17)/2) and 110 g catalogue mass frame a 17 mm bore bearing rated at 15.9 kN C — roughly 0.94 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line runs at 40°, one 7303 reacts thrust in a single direction; bidirectional shafts need a DB or DF pair with defined preload, and a rotating inner ring on a 17 mm shaft typically takes a j5 seat with an H7 housing bore.", "applications": [ "textile and wire-guide spindles", "small gear pumps and metering pumps", "encoder and resolver mountings", "instrument and rotary-table drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "At a 17 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7303 shows up as spindle vibration long before it fails.", "The 73xx medium section at 17 mm bore (47×14 mm) is heavier-rated than the 7203 but runs hotter at the same speed; do not substitute a 7303 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7303 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7303 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "The 110 g mass and 14 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7303.", "The 15.9/8.3 kN ratings are SKF catalogue 17000 values for the 7303 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7303 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7303 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7303 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7303?", "a": "The SKF 7303 BEP is a single-row angular-contact ball bearing with 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 15.9 kN, C0 8.3 kN, fatigue load limit Pu 0.355 kN, reference speed 20,000 r/min, limiting speed 19,000 r/min, mass about 110 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7303 bore code work?", "a": "The last two digits of 7303 are bore code 03, giving a 17 mm bore under the exception table. The 47 mm OD and 14 mm width come from the ISO 15 diameter-series plan, shared with the 6303 deep-groove envelope. Codes 00–03 follow the 10/12/15/17 mm exception table." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7303 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7303 compare with a deep-groove 6303?", "a": "Both use the 17×47×14 mm ISO 15 envelope, but the angular-contact 7303 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6303 cannot be dropped into a combined-load 7303 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7303-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7303 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7303-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7303 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7303-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7303 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-303-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 303 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7303 BEP" ], "locale_variants": {} }, { "sku": "7304", "brand": "SKF", "manufacturer_designation": "SKF 7304 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 17.4, "static_load_kN": 9.5, "fatigue_load_limit_kN": 0.4, "reference_speed_rpm": 17000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7304 BEP belongs to SKF's universal single-row angular-contact range — the 20 mm bore entry in the medium (7300) series, dimensioned 52 mm OD and 15 mm wide to the same ISO 15 boundary plan as the 6304 deep-groove envelope.The code breaks down as type prefix 7 (angular contact), diameter series 3 (the medium section), and bore code 04 = 20 mm; dimensions 20×52×15 mm therefore match the 6304 deep-groove envelope even though the internal design is different. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Catalogue mass 140 g for the 20×52×15 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. For a 20 mm shaft the usual seat is k5 with an H7 housing when the inner ring rotates; arrange two 7304 bearings as a set for two-direction location and set preload from the load diagram, never from assembly feel.", "applications": [ "encoder and resolver mountings", "instrument and rotary-table drives", "dental and laboratory high-speed rotors", "small machine-tool spindles and high-speed heads" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "hard-particle indentation of the asymmetric raceway in unfiltered oil" ], "pitfalls": [ "At a 20 mm bore the thin rings are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 7304 shows up as spindle vibration long before it fails.", "The 73xx medium section at 20 mm bore (52×15 mm) is heavier-rated than the 7204 but runs hotter at the same speed; do not substitute a 7304 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Do not mix execution classes inside one 7304 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Preload is a design value, not an assembly feel: excessive preload in the 7304 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "Open 7304 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 17.4/9.5 kN ratings are SKF catalogue 17000 values for the 7304 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7304 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7304 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7304 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7304?", "a": "The SKF 7304 BEP is a single-row angular-contact ball bearing with 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 17.4 kN, C0 9.5 kN, fatigue load limit Pu 0.4 kN, reference speed 17,000 r/min, limiting speed 16,000 r/min, mass about 140 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 16,000 r/min value is the one to design against." }, { "q": "How does the 7304 bore code work?", "a": "The last two digits of 7304 are bore code 04, so 04 × 5 = 20 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 diameter-series plan, shared with the 6304 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7304 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7304 compare with a deep-groove 6304?", "a": "Both use the 20×52×15 mm ISO 15 envelope, but the angular-contact 7304 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 17.4 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7304-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7304-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7304 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7304-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7304 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7304-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7304 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7304-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7304 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7304-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7304 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7304-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7304 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7304-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7304 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-304-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 304 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-304-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 304 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-304-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 304 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7304 BEP" ], "locale_variants": {} }, { "sku": "7305", "brand": "SKF", "manufacturer_designation": "SKF 7305 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 24.2, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 14000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 25 mm shaft carrying combined load, SKF lists 7305 under catalogue execution 7305 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the medium (7300) series of the 7xxx family.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 3 is ISO diameter series 3 (medium section), and the last two digits encode the 25 mm bore; the 62 mm OD and 17 mm width follow the ISO 15 general plan. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). At 14,000 r/min reference speed the 18.5 mm-section 7305 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 14,000 r/min as the mechanical ceiling. Mounting practice for 7305: the rotating ring takes the interference fit (k5 on a 25 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units", "servo drives and precision gearboxes", "gear pumps and screw-type pumps" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 25 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7305 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 25 mm bore (62×17 mm) is heavier-rated than the 7205 but runs hotter at the same speed; do not substitute a 7305 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7305 mounting error.", "A single 7305 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 24.2/14 kN ratings are SKF catalogue 17000 values for the 7305 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7305 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7305 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7305 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7305?", "a": "The SKF 7305 BEP is a single-row angular-contact ball bearing with 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 24.2 kN, C0 14 kN, fatigue load limit Pu 0.6 kN, reference speed 14,000 r/min, limiting speed 14,000 r/min, mass about 230 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 14,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7305 bore code work?", "a": "The last two digits of 7305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 17 mm width come from the ISO 15 diameter-series plan, shared with the 6305 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7305 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7305 compare with a deep-groove 6305?", "a": "Both use the 25×62×17 mm ISO 15 envelope, but the angular-contact 7305 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7305 design to perform." } ], "cross_ref": [ { "equiv_sku": "7305-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7305-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BEY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BEY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7305 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7305-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7305 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-305-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 305 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-305-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 305 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7305 BEP" ], "locale_variants": {} }, { "sku": "7306", "brand": "SKF", "manufacturer_designation": "SKF 7306 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 340, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 32.5, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 12000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7306 (7306 BEP) is the medium (7300) series angular-contact choice for a 30 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 72×19 mm ISO 15 envelope.Digit by digit, 7306 reads as bearing type 7 (single-row angular contact), medium section diameter series 3, and bore reference 06 resolving to 30 mm; 72 mm OD and 19 width are the matching ISO 15 boundary values. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. Speed planning uses two different ceilings: 12,000 r/min reference (thermal, under representative load) and 12,000 r/min limiting (mechanical cage/ball limit) — for this size the catalogue lists them at the same value. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7306 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "servo drives and precision gearboxes", "gear pumps and screw-type pumps", "centrifugal and vacuum pumps", "automotive and industrial transmissions" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7306 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 30 mm bore (72×19 mm) is heavier-rated than the 7206 but runs hotter at the same speed; do not substitute a 7306 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7306 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "At the 32.5 kN rating of 7306, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 12,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Catalogue reference speed and limiting speed are different limits: the 12,000 r/min reference is a thermal criterion under load, while the 12,000 r/min limiting value is the mechanical ceiling — observe both.", "The 32.5/19.3 kN ratings are SKF catalogue 17000 values for the 7306 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7306 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7306 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7306 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7306?", "a": "The SKF 7306 BEP is a single-row angular-contact ball bearing with 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 32.5 kN, C0 19.3 kN, fatigue load limit Pu 0.815 kN, reference speed 12,000 r/min, limiting speed 12,000 r/min, mass about 340 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7306 bore code work?", "a": "The last two digits of 7306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 19 mm width come from the ISO 15 diameter-series plan, shared with the 6306 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7306 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7306 compare with a deep-groove 6306?", "a": "Both use the 30×72×19 mm ISO 15 envelope, but the angular-contact 7306 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6306 cannot be dropped into a combined-load 7306 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7306-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×72×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7306-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7306 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7306-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7306 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7306-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7306 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7306-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7306 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7306-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7306 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7306-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7306 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7306-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7306 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-306-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 306 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-306-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 306 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-306-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 306 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7306 BEP" ], "locale_variants": {} }, { "sku": "7307", "brand": "SKF", "manufacturer_designation": "SKF 7307 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 450, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 39, "static_load_kN": 24.5, "fatigue_load_limit_kN": 1.04, "reference_speed_rpm": 11000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7307 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 35 mm shaft, medium (7300) series, with an open PA66-caged execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 7307 means angular-contact type 7, medium section section 3, 35 mm bore — which is why the 80×21 mm outline swaps dimensionally with a 6307, though the load behaviour does not. Suffix letters after 7307 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. With C 39 kN and C0 24.5 kN, the 7307 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 10,000 r/min. A single 7307 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "centrifugal and vacuum pumps", "automotive and industrial transmissions", "belt-driven fan and blower shafts", "printing cylinders and packaging machine shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7307 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 35 mm bore (80×21 mm) is heavier-rated than the 7207 but runs hotter at the same speed; do not substitute a 7307 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Preload is a design value, not an assembly feel: excessive preload in the 7307 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7307 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "The 7307 shares its ISO 15 envelope with deep-groove 6307 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 39/24.5 kN ratings are SKF catalogue 17000 values for the 7307 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7307 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7307 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7307 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7307?", "a": "The SKF 7307 BEP is a single-row angular-contact ball bearing with 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 39 kN, C0 24.5 kN, fatigue load limit Pu 1.04 kN, reference speed 11,000 r/min, limiting speed 10,000 r/min, mass about 450 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 10,000 r/min value is the one to design against." }, { "q": "How does the 7307 bore code work?", "a": "The last two digits of 7307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 21 mm width come from the ISO 15 diameter-series plan, shared with the 6307 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7307 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7307 compare with a deep-groove 6307?", "a": "Both use the 35×80×21 mm ISO 15 envelope, but the angular-contact 7307 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 39 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7307-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×80×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7307-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7307 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7307-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7307 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-307-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 307 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-307-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 307 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-307-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 307 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7307 BEP" ], "locale_variants": {} }, { "sku": "7308", "brand": "SKF", "manufacturer_designation": "SKF 7308 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 46.2, "static_load_kN": 30.5, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 9500, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7308 is SKF's single-row angular-contact ball bearing in the medium (7300) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7308 BEP in the SKF Rolling Bearings catalogue.On the SKF nameplate, 7308 follows the ISO numbering convention: 7 for the angular-contact type, 3 for the medium section section, final digits 08 for the 40 mm bore. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7308 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 1.29 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.66 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7308 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 40 mm shaft positions.", "applications": [ "belt-driven fan and blower shafts", "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units", "servo drives and precision gearboxes" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "brinelling from pressing the ring home through the balls or from static overload" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7308 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 40 mm bore (90×23 mm) is heavier-rated than the 7208 but runs hotter at the same speed; do not substitute a 7308 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "A single 7308 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "Do not mix execution classes inside one 7308 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 90 mm race release as noise within the first running hours.", "The 46.2/30.5 kN ratings are SKF catalogue 17000 values for the 7308 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7308 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7308 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7308 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7308?", "a": "The SKF 7308 BEP is a single-row angular-contact ball bearing with 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 46.2 kN, C0 30.5 kN, fatigue load limit Pu 1.29 kN, reference speed 9,500 r/min, limiting speed 9,000 r/min, mass about 620 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 9,500 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7308 bore code work?", "a": "The last two digits of 7308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 diameter-series plan, shared with the 6308 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7308 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7308 compare with a deep-groove 6308?", "a": "Both use the 40×90×23 mm ISO 15 envelope, but the angular-contact 7308 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7308 design to perform." } ], "cross_ref": [ { "equiv_sku": "7308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7308-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7308 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7308-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7308 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7308-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7308 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7308-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7308 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7308-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7308 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7308-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7308 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7308-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7308 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-308-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 308 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-308-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 308 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-308-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 308 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7308 BEP" ], "locale_variants": {} }, { "sku": "7309", "brand": "SKF", "manufacturer_designation": "SKF 7309 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 820, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 55.9, "static_load_kN": 37.5, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8500, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7309 BEP is a 45×100×25 mm single-row angular-contact ball bearing — the medium (7300) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6309 deep-groove size but cut for combined radial and one-direction axial load.The code breaks down as type prefix 7 (angular contact), diameter series 3 (the medium section), and bore code 09 = 45 mm; dimensions 45×100×25 mm therefore match the 6309 deep-groove envelope even though the internal design is different. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Selection arithmetic: the C0/C ratio is about 0.67 (static 37.5 kN against dynamic 55.9 kN), typical of a 40° angle sized for axial capacity, and the 1.6 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7309 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "machine-tool spindles and spindle units", "servo drives and precision gearboxes", "gear pumps and screw-type pumps", "centrifugal and vacuum pumps" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7309 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 45 mm bore (100×25 mm) is heavier-rated than the 7209 but runs hotter at the same speed; do not substitute a 7309 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "At the 55.9 kN rating of 7309, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7309 mounting error.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 55.9/37.5 kN ratings are SKF catalogue 17000 values for the 7309 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7309 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7309 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7309 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7309?", "a": "The SKF 7309 BEP is a single-row angular-contact ball bearing with 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 55.9 kN, C0 37.5 kN, fatigue load limit Pu 1.6 kN, reference speed 8,500 r/min, limiting speed 8,000 r/min, mass about 820 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7309 bore code work?", "a": "The last two digits of 7309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 diameter-series plan, shared with the 6309 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7309 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7309 compare with a deep-groove 6309?", "a": "Both use the 45×100×25 mm ISO 15 envelope, but the angular-contact 7309 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6309 cannot be dropped into a combined-load 7309 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7309-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7309 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7309-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7309 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7309-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7309 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7309-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7309 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7309-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7309 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7309-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7309 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7309-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7309 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-309-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 309 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-309-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 309 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-309-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 309 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-309-PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 309 PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7309 BEP" ], "locale_variants": {} }, { "sku": "7310", "brand": "SKF", "manufacturer_designation": "SKF 7310 BECBP", "series": "7300-series", "type": "angular_contact", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 75, "static_load_kN": 51, "fatigue_load_limit_kN": 2.16, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7310 appears as 7310 BECBP: a 40° contact-angle, open, one-direction-thrust ball bearing in the medium (7300) series, supplied with a glass-fibre PA66 cage as standard.Numbering ties the bearing to its envelope: 7310 means angular-contact type 7, medium section section 3, 50 mm bore — which is why the 110×27 mm outline swaps dimensionally with a 6310, though the load behaviour does not. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. CB means the side faces are ground for universal matching with Normal internal axial clearance, which is the starting point for field-set preload rather than a factory-matched fixed-preload set. Catalogue mass 1100 g for the 50×110×27 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7310 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "automotive and industrial transmissions", "belt-driven fan and blower shafts", "printing cylinders and packaging machine shafts", "machine-tool spindles and spindle units" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 7310 pair heats, loses preload control and smears the raceways.", "The 73xx medium section at 50 mm bore (110×27 mm) is heavier-rated than the 7210 but runs hotter at the same speed; do not substitute a 7310 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "At the 75 kN rating of 7310, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix execution classes inside one 7310 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 75/51 kN ratings are SKF catalogue 17000 values for the 7310 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7310 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7310 BECBP designation when purchasing and match the execution to the mounting arrangement.", "The CB execution (7310 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7310?", "a": "The SKF 7310 BECBP is a single-row angular-contact ball bearing with 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 75 kN, C0 51 kN, fatigue load limit Pu 2.16 kN, reference speed 7,500 r/min, limiting speed 8,000 r/min, mass about 1100 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 7,500 r/min value is the one to design against." }, { "q": "How does the 7310 bore code work?", "a": "The last two digits of 7310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 27 mm width come from the ISO 15 diameter-series plan, shared with the 6310 deep-groove envelope." }, { "q": "What do the 73xx and BECBP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. CB adds Normal axial clearance with ground faces for universal DB/DF/DT pair mounting. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7310 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7310 compare with a deep-groove 6310?", "a": "Both use the 50×110×27 mm ISO 15 envelope, but the angular-contact 7310 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 75 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7310-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7310-BE-2RZP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7310 BE-2RZP (glass-fibre PA66 cage, non-contact NBR seals (-2RZ)) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7310-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7310 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7310-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7310 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7310-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7310 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7310-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7310 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7310-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7310 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-310-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 310 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-310-PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 310 PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7310 BECBP" ], "locale_variants": {} }, { "sku": "7311", "brand": "SKF", "manufacturer_designation": "SKF 7311 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 79.3, "static_load_kN": 55, "fatigue_load_limit_kN": 2.32, "reference_speed_rpm": 7000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7311 BEP belongs to SKF's universal single-row angular-contact range — the 55 mm bore entry in the medium (7300) series, dimensioned 120 mm OD and 29 mm wide to the same ISO 15 boundary plan as the 6311 deep-groove envelope.On the SKF nameplate, 7311 follows the ISO numbering convention: 7 for the angular-contact type, 3 for the medium section section, final digits 11 for the 55 mm bore. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). At 7,000 r/min reference speed the 32.5 mm-section 7311 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 6,700 r/min as the mechanical ceiling. A single 7311 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "brinelling from pressing the ring home through the balls or from static overload" ], "pitfalls": [ "Mount the 55 mm bore 7311 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 55 mm bore (120×29 mm) is heavier-rated than the 7211 but runs hotter at the same speed; do not substitute a 7311 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7311 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7311 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 7,000 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.", "The 79.3/55 kN ratings are SKF catalogue 17000 values for the 7311 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7311 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7311 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7311 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7311?", "a": "The SKF 7311 BEP is a single-row angular-contact ball bearing with 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 79.3 kN, C0 55 kN, fatigue load limit Pu 2.32 kN, reference speed 7,000 r/min, limiting speed 6,700 r/min, mass about 1400 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 7,000 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7311 bore code work?", "a": "The last two digits of 7311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 29 mm width come from the ISO 15 diameter-series plan, shared with the 6311 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7311 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7311 compare with a deep-groove 6311?", "a": "Both use the 55×120×29 mm ISO 15 envelope, but the angular-contact 7311 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7311 design to perform." } ], "cross_ref": [ { "equiv_sku": "7311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7311-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7311 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7311-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7311 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7311-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7311 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7311-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7311 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7311-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7311 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7311-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7311 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-311-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 311 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-311-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 311 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7311 BEP" ], "locale_variants": {} }, { "sku": "7312", "brand": "SKF", "manufacturer_designation": "SKF 7312 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 95.6, "static_load_kN": 69.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 60 mm shaft carrying combined load, SKF lists 7312 under catalogue execution 7312 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the medium (7300) series of the 7xxx family.The code breaks down as type prefix 7 (angular contact), diameter series 3 (the medium section), and bore code 12 = 60 mm; dimensions 60×130×31 mm therefore match the 6312 deep-groove envelope even though the internal design is different. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. Speed planning uses two different ceilings: 6,300 r/min reference (thermal, under representative load) and 6,000 r/min limiting (mechanical cage/ball limit). Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7312 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 60 mm shaft positions.", "applications": [ "industrial gearboxes and speed reducers", "process pump and compressor drives", "printing and paper-machine rolls", "crane sheave and hoist gearboxes" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 60 mm bore 7312 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 60 mm bore (130×31 mm) is heavier-rated than the 7212 but runs hotter at the same speed; do not substitute a 7312 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Do not mix execution classes inside one 7312 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7312 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "The 7312 shares its ISO 15 envelope with deep-groove 6312 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 95.6/69.5 kN ratings are SKF catalogue 17000 values for the 7312 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7312 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7312 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7312 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7312?", "a": "The SKF 7312 BEP is a single-row angular-contact ball bearing with 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 95.6 kN, C0 69.5 kN, fatigue load limit Pu 3 kN, reference speed 6,300 r/min, limiting speed 6,000 r/min, mass about 1750 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7312 bore code work?", "a": "The last two digits of 7312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 diameter-series plan, shared with the 6312 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7312 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7312 compare with a deep-groove 6312?", "a": "Both use the 60×130×31 mm ISO 15 envelope, but the angular-contact 7312 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6312 cannot be dropped into a combined-load 7312 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7312-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7312 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7312-BECBP", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7312 BECBP shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7312-BECBPH", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7312 BECBPH shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7312-BECBY", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7312 BECBY shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7312-BECBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7312 BECBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "7312-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7312 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-312-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 312 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-312-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 312 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-312-PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 312 PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7312 BEP" ], "locale_variants": {} }, { "sku": "7313", "brand": "SKF", "manufacturer_designation": "SKF 7313 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 108, "static_load_kN": 80, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 6000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7313 (7313 BEP) is the medium (7300) series angular-contact choice for a 65 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 140×33 mm ISO 15 envelope.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 3 is ISO diameter series 3 (medium section), and the last two digits encode the 65 mm bore; the 140 mm OD and 33 mm width follow the ISO 15 general plan. Suffix letters after 7313 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. With C 108 kN and C0 80 kN, the 7313 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 5,600 r/min. Specify pairs rather than single units wherever thrust reverses: the 40° angle of 7313 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack in one direction and fret its seat.", "applications": [ "printing and paper-machine rolls", "crane sheave and hoist gearboxes", "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "pre-grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 65 mm bore 7313 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 65 mm bore (140×33 mm) is heavier-rated than the 7213 but runs hotter at the same speed; do not substitute a 7313 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7313 mounting error.", "Preload is a design value, not an assembly feel: excessive preload in the 7313 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the inner ring only, or brinell marks on the 140 mm race release as noise within the first running hours.", "The 108/80 kN ratings are SKF catalogue 17000 values for the 7313 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7313 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7313 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7313 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7313?", "a": "The SKF 7313 BEP is a single-row angular-contact ball bearing with 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 108 kN, C0 80 kN, fatigue load limit Pu 3.35 kN, reference speed 6,000 r/min, limiting speed 5,600 r/min, mass about 2150 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 5,600 r/min value is the one to design against." }, { "q": "How does the 7313 bore code work?", "a": "The last two digits of 7313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 diameter-series plan, shared with the 6313 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7313 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7313 compare with a deep-groove 6313?", "a": "Both use the 65×140×33 mm ISO 15 envelope, but the angular-contact 7313 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 108 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7313-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7313 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7313-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7313 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7313-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7313 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7313-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7313 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7313-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7313 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7313-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7313 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-313-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 313 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-313-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 313 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7313 BEP" ], "locale_variants": {} }, { "sku": "7314", "brand": "SKF", "manufacturer_designation": "SKF 7314 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 119, "static_load_kN": 90, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 5600, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7314 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 70 mm shaft, medium (7300) series, with an open PA66-caged execution and one-direction axial capacity.Digit by digit, 7314 reads as bearing type 7 (single-row angular contact), medium section diameter series 3, and bore reference 14 resolving to 70 mm; 150 mm OD and 35 width are the matching ISO 15 boundary values. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7314 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 3.65 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.76 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Because the contact line runs at 40°, one 7314 reacts thrust in a single direction; bidirectional shafts need a DB or DF pair with defined preload, and a rotating inner ring on a 70 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles", "industrial gearboxes and speed reducers" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "mounting score marks when the bearing is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 70 mm bore 7314 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 70 mm bore (150×35 mm) is heavier-rated than the 7214 but runs hotter at the same speed; do not substitute a 7314 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7314 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "A single 7314 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "The PA66 cage is rated for 120 °C continuous service; sustained hotter running (hot process gas, heat soak from a coupling) embrittles the cage — select the machined-brass BECBM execution for positions above that.", "The 119/90 kN ratings are SKF catalogue 17000 values for the 7314 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7314 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7314 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7314 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7314?", "a": "The SKF 7314 BEP is a single-row angular-contact ball bearing with 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 119 kN, C0 90 kN, fatigue load limit Pu 3.65 kN, reference speed 5,600 r/min, limiting speed 5,300 r/min, mass about 2650 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 5,600 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7314 bore code work?", "a": "The last two digits of 7314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 35 mm width come from the ISO 15 diameter-series plan, shared with the 6314 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7314 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7314 compare with a deep-groove 6314?", "a": "Both use the 70×150×35 mm ISO 15 envelope, but the angular-contact 7314 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7314 design to perform." } ], "cross_ref": [ { "equiv_sku": "7314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7314-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7314 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7314-ACCBM", "equiv_brand": "SKF", "level": "partial", "note": "SKF 7314 ACCBM shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-314-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 314 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-314-MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 314 MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-314-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 314 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7314 BEP" ], "locale_variants": {} }, { "sku": "7315", "brand": "SKF", "manufacturer_designation": "SKF 7315 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 3200, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 125, "static_load_kN": 98, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7315 is SKF's single-row angular-contact ball bearing in the medium (7300) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7315 BEP in the SKF Rolling Bearings catalogue.Numbering ties the bearing to its envelope: 7315 means angular-contact type 7, medium section section 3, 75 mm bore — which is why the 160×37 mm outline swaps dimensionally with a 6315, though the load behaviour does not. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Selection arithmetic: the C0/C ratio is about 0.78 (static 98 kN against dynamic 125 kN), typical of a 40° angle sized for axial capacity, and the 3.8 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. For a 75 mm shaft the usual seat is k5 with an H7 housing when the inner ring rotates; arrange two 7315 bearings as a set for two-direction location and set preload from the load diagram, never from assembly feel.", "applications": [ "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives", "printing and paper-machine rolls" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "raceway staining from water in the lubricant during idle periods" ], "pitfalls": [ "Mount the 75 mm bore 7315 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 75 mm bore (160×37 mm) is heavier-rated than the 7215 but runs hotter at the same speed; do not substitute a 7315 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Preload is a design value, not an assembly feel: excessive preload in the 7315 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "At the 125 kN rating of 7315, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,000 r/min speed end and heavier preload only where moment stiffness dominates.", "The 3200 g mass and 37 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7315.", "The 125/98 kN ratings are SKF catalogue 17000 values for the 7315 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7315 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7315 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7315 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7315?", "a": "The SKF 7315 BEP is a single-row angular-contact ball bearing with 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 125 kN, C0 98 kN, fatigue load limit Pu 3.8 kN, reference speed 5,300 r/min, limiting speed 5,000 r/min, mass about 3200 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7315 bore code work?", "a": "The last two digits of 7315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 37 mm width come from the ISO 15 diameter-series plan, shared with the 6315 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7315 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7315 compare with a deep-groove 6315?", "a": "Both use the 75×160×37 mm ISO 15 envelope, but the angular-contact 7315 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6315 cannot be dropped into a combined-load 7315 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7315-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7315 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7315-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7315 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7315-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7315 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7315-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7315 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7315-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7315 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-315-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 315 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-315-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 315 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7315 BEP" ], "locale_variants": {} }, { "sku": "7316", "brand": "SKF", "manufacturer_designation": "SKF 7316 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 3800, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 135, "static_load_kN": 110, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 7316 BEP is a 80×170×39 mm single-row angular-contact ball bearing — the medium (7300) series of the SKF 7xxx line, built on the ISO 15 envelope shared with the 6316 deep-groove size but cut for combined radial and one-direction axial load.On the SKF nameplate, 7316 follows the ISO numbering convention: 7 for the angular-contact type, 3 for the medium section section, final digits 16 for the 80 mm bore. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). The 45.0 mm radial section height ((170−80)/2) and 3800 g catalogue mass frame a 80 mm bore bearing rated at 135 kN C — roughly 1.69 kN of dynamic capacity per millimetre of bore before application factors. Mounting practice for 7316: the rotating ring takes the interference fit (k5 on a 80 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "process pump and compressor drives", "printing and paper-machine rolls", "crane sheave and hoist gearboxes", "agricultural and construction machinery drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "hard-particle indentation of the asymmetric raceway in unfiltered oil" ], "pitfalls": [ "Mount the 80 mm bore 7316 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 80 mm bore (170×39 mm) is heavier-rated than the 7216 but runs hotter at the same speed; do not substitute a 7316 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "A single 7316 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use a DB or DF matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7316 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "Open 7316 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 135/110 kN ratings are SKF catalogue 17000 values for the 7316 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7316 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7316 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7316 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7316?", "a": "The SKF 7316 BEP is a single-row angular-contact ball bearing with 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 135 kN, C0 110 kN, fatigue load limit Pu 4.15 kN, reference speed 5,000 r/min, limiting speed 4,500 r/min, mass about 3800 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 4,500 r/min value is the one to design against." }, { "q": "How does the 7316 bore code work?", "a": "The last two digits of 7316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 39 mm width come from the ISO 15 diameter-series plan, shared with the 6316 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7316 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7316 compare with a deep-groove 6316?", "a": "Both use the 80×170×39 mm ISO 15 envelope, but the angular-contact 7316 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 135 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7316-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7316-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7316-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7316-BECBPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BECBPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7316-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7316-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7316 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-316-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 316 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-316-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 316 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7316 BEP" ], "locale_variants": {} }, { "sku": "7317", "brand": "SKF", "manufacturer_designation": "SKF 7317 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 146, "static_load_kN": 122, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 4500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 7317 appears as 7317 BEP: a 40° contact-angle, open, one-direction-thrust ball bearing in the medium (7300) series, supplied with a glass-fibre PA66 cage as standard.The code breaks down as type prefix 7 (angular contact), diameter series 3 (the medium section), and bore code 17 = 85 mm; dimensions 85×180×41 mm therefore match the 6317 deep-groove envelope even though the internal design is different. Here B marks the steep 40° contact angle (the highest-capacity single-row angle), E the modernised internal geometry and P the glass-fibre nylon cage; the same bare size in a 25° A-angle or brass M-cage execution carries a different suffix. Catalogue mass 4450 g for the 85×180×41 mm open execution covers the PA66 cage and standard ball complement; sealed or brass-cage variants of the same size differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7317 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "crane sheave and hoist gearboxes", "agricultural and construction machinery drives", "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 85 mm bore 7317 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 85 mm bore (180×41 mm) is heavier-rated than the 7217 but runs hotter at the same speed; do not substitute a 7317 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "At the 146 kN rating of 7317, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,300 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix execution classes inside one 7317 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 146/122 kN ratings are SKF catalogue 17000 values for the 7317 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7317 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7317 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7317 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7317?", "a": "The SKF 7317 BEP is a single-row angular-contact ball bearing with 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 146 kN, C0 122 kN, fatigue load limit Pu 4.5 kN, reference speed 4,500 r/min, limiting speed 4,300 r/min, mass about 4450 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 4,500 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7317 bore code work?", "a": "The last two digits of 7317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 41 mm width come from the ISO 15 diameter-series plan, shared with the 6317 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7317 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7317 compare with a deep-groove 6317?", "a": "Both use the 85×180×41 mm ISO 15 envelope, but the angular-contact 7317 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7317 design to perform." } ], "cross_ref": [ { "equiv_sku": "7317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7317-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7317-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7317-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7317-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7317-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7317-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7317 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-317-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 317 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7317 BEP" ], "locale_variants": {} }, { "sku": "7318", "brand": "SKF", "manufacturer_designation": "SKF 7318 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 5200, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 156, "static_load_kN": 134, "fatigue_load_limit_kN": 4.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7318 BEP belongs to SKF's universal single-row angular-contact range — the 90 mm bore entry in the medium (7300) series, dimensioned 190 mm OD and 43 mm wide to the same ISO 15 boundary plan as the 6318 deep-groove envelope.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 3 is ISO diameter series 3 (medium section), and the last two digits encode the 90 mm bore; the 190 mm OD and 43 mm width follow the ISO 15 general plan. Suffix letters after 7318 describe the build: B fixes the 40° contact angle, E denotes the reinforced internal geometry, and P identifies the moulded PA66 glass-fibre cage rather than a stamped-steel or machined-brass one. At 4,300 r/min reference speed the 50.0 mm-section 7318 is governed thermally by preload and lubricant flow; oil-air or grease pack selection should be made against that value, with 4,000 r/min as the mechanical ceiling. A single 7318 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "vibrating screens and shale shaker shafts", "medium and large machine-tool spindles", "industrial gearboxes and speed reducers", "process pump and compressor drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "false brinelling on idle paired sets exposed to machine vibration", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 90 mm bore 7318 by induction heating of the inner ring (max 120 °C — the PA66 cage sets the ceiling, not the steel); driving it home through the outer ring or balls brinells the asymmetric raceway.", "The 73xx medium section at 90 mm bore (190×43 mm) is heavier-rated than the 7218 but runs hotter at the same speed; do not substitute a 7318 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "When the outer ring rotates, reverse the fit logic and provide outer-ring location; the steep 40° contact of 7318 pushes the rings apart under load, so a non-located outer ring walks its seat even when the shaft is fixed.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7318 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 4,300 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.", "The 156/134 kN ratings are SKF catalogue 17000 values for the 7318 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7318 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7318 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7318 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7318?", "a": "The SKF 7318 BEP is a single-row angular-contact ball bearing with 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 156 kN, C0 134 kN, fatigue load limit Pu 4.8 kN, reference speed 4,300 r/min, limiting speed 4,000 r/min, mass about 5200 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7318 bore code work?", "a": "The last two digits of 7318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 43 mm width come from the ISO 15 diameter-series plan, shared with the 6318 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7318 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7318 compare with a deep-groove 6318?", "a": "Both use the 90×190×43 mm ISO 15 envelope, but the angular-contact 7318 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6318 cannot be dropped into a combined-load 7318 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7318-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7318-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7318-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7318-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7318-BEGAPH", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BEGAPH (PEEK cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7318-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7318 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-318-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 318 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-318-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 318 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7318 BEP" ], "locale_variants": {} }, { "sku": "7319", "brand": "SKF", "manufacturer_designation": "SKF 7319 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 6050, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 168, "static_load_kN": 150, "fatigue_load_limit_kN": 5.2, "reference_speed_rpm": 4000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 95 mm shaft carrying combined load, SKF lists 7319 under catalogue execution 7319 BEP: one open single-row angular-contact ball bearing, 40° contact angle, in the medium (7300) series of the 7xxx family.Digit by digit, 7319 reads as bearing type 7 (single-row angular contact), medium section diameter series 3, and bore reference 19 resolving to 95 mm; 200 mm OD and 45 width are the matching ISO 15 boundary values. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7319 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. Speed planning uses two different ceilings: 4,000 r/min reference (thermal, under representative load) and 3,800 r/min limiting (mechanical cage/ball limit). Note the minimum-axial-load requirement: at light radial load and high speed the balls of 7319 must still be held into the contact ellipse, which is another reason the catalogue recommends paired mounting with controlled preload on 95 mm shaft positions.", "applications": [ "large process pumps and compressors", "marine propulsion and deck machinery", "wind-turbine gearbox shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "ball skidding when the induced axial load unloads the inactive bearing of a pair", "raceway spalling from axial overload beyond the single-direction thrust rating", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 95 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 73xx medium section at 95 mm bore (200×45 mm) is heavier-rated than the 7219 but runs hotter at the same speed; do not substitute a 7319 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Do not mix execution classes inside one 7319 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7319 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "The 7319 shares its ISO 15 envelope with deep-groove 6319 but is not a drop-in replacement: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 168/150 kN ratings are SKF catalogue 17000 values for the 7319 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7319 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7319 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7319 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7319?", "a": "The SKF 7319 BEP is a single-row angular-contact ball bearing with 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 168 kN, C0 150 kN, fatigue load limit Pu 5.2 kN, reference speed 4,000 r/min, limiting speed 3,800 r/min, mass about 6050 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 3,800 r/min value is the one to design against." }, { "q": "How does the 7319 bore code work?", "a": "The last two digits of 7319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 45 mm width come from the ISO 15 diameter-series plan, shared with the 6319 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7319 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7319 compare with a deep-groove 6319?", "a": "Both use the 95×200×45 mm ISO 15 envelope, but the angular-contact 7319 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 168 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7319-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7319 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7319-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7319 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7319-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7319 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7319-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7319 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7319-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7319 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-319-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 319 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." }, { "equiv_sku": "QJ-319-N2PHAS", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 319 N2PHAS shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7319 BEP" ], "locale_variants": {} }, { "sku": "7320", "brand": "SKF", "manufacturer_designation": "SKF 7320 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 7500, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 203, "static_load_kN": 190, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 3800, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 7320 (7320 BEP) is the medium (7300) series angular-contact choice for a 100 mm shaft — one row of balls on a steepened, asymmetric raceway giving a nominal 40° contact angle inside the 215×47 mm ISO 15 envelope.The code breaks down as type prefix 7 (angular contact), diameter series 3 (the medium section), and bore code 20 = 100 mm; dimensions 100×215×47 mm therefore match the 6320 deep-groove envelope even though the internal design is different. The letters mean B = 40° angle, E = enhanced ball complement and race geometry, P = PA66 glass-fibre cage, so this 7320 is the open polymer-caged execution rather than the sealed or brass-cage catalogue variants. The 6.4 kN Pu figure feeds the SKF adjusted-life equation at contaminated or partial-film conditions, and the 0.94 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Mounting practice for 7320: the rotating ring takes the interference fit (k5 on a 100 mm rotating shaft), the stationary ring slides for axial location, and reversing-thrust duty demands a paired DB/DF set rather than one bearing.", "applications": [ "mineral-processing and crusher drives", "large mud pumps and offshore winch drums", "heavy industrial gearboxes", "large process pumps and compressors" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "contact-angle shift and edge loading after a pair is tilted in by uneven locknut torque", "preload loss as a matched pair runs loose, letting the balls skid and smear the raceways", "cage pocket damage when the bearing is started cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 100 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 73xx medium section at 100 mm bore (215×47 mm) is heavier-rated than the 7220 but runs hotter at the same speed; do not substitute a 7320 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "Do not mix execution classes inside one 7320 pair — universal-matchable (CB) bearings are ground for arbitrary pairing, but a CB unit paired with an unmatched basic BEP bearing will not share preload evenly.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7320 mounting error.", "The 7500 g mass and 47 mm width mean locknut and spacer faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one shoulder of 7320.", "The 203/190 kN ratings are SKF catalogue 17000 values for the 7320 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7320 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7320 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7320 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7320?", "a": "The SKF 7320 BEP is a single-row angular-contact ball bearing with 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 203 kN, C0 190 kN, fatigue load limit Pu 6.4 kN, reference speed 3,800 r/min, limiting speed 3,600 r/min, mass about 7500 g. It is an open 40° contact-angle bearing with a PA66 cage. Preload and lubricant film move the real thermal limit, so treat 3,800 r/min as catalogue conditions, not a guarantee in the housing." }, { "q": "How does the 7320 bore code work?", "a": "The last two digits of 7320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 47 mm width come from the ISO 15 diameter-series plan, shared with the 6320 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7320 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Preload light/medium choice changes stiffness and heat, so calculate it from the load diagram rather than torquing until the pair feels tight." }, { "q": "How does 7320 compare with a deep-groove 6320?", "a": "Both use the 100×215×47 mm ISO 15 envelope, but the angular-contact 7320 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. Envelope interchange is therefore dimensional only; the application must actually present axial load for the 7320 design to perform." } ], "cross_ref": [ { "equiv_sku": "7320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7320-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7320 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7320-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7320 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7320-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7320 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7320-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7320 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7320-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7320 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-320-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 320 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7320 BEP" ], "locale_variants": {} }, { "sku": "7321", "brand": "SKF", "manufacturer_designation": "SKF 7321 BEP", "series": "7300-series", "type": "angular_contact", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 8550, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 203, "static_load_kN": 193, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 7321 BEP in the SKF Rolling Bearings catalogue denotes a single-row 40° angular-contact ball bearing for a 105 mm shaft, medium (7300) series, with an open PA66-caged execution and one-direction axial capacity.Reading the designation: the leading 7 marks a single-row angular-contact ball bearing, the 3 is ISO diameter series 3 (medium section), and the last two digits encode the 105 mm bore; the 225 mm OD and 49 mm width follow the ISO 15 general plan. In SKF suffix language B sets the steep 40° angle for high axial capacity, E is the optimised internal design, and P is the polymer cage; variants with seals (BE-2RZP), 25° angles (A/ACC) or brass cages (BECBM) are separate order numbers. Selection arithmetic: the C0/C ratio is about 0.95 (static 193 kN against dynamic 203 kN), typical of a 40° angle sized for axial capacity, and the 6.4 kN fatigue load limit Pu is the equivalent-load floor used in the SKF life calculation. Fit selection follows the rotating ring — interference on a rotating inner ring — and two 7321 units are required to take reversing thrust; keep the induced axial load (0.5·Fr/Y for the 40° angle) inside the rated capacity when calculating the pair.", "applications": [ "heavy industrial gearboxes", "large process pumps and compressors", "marine propulsion and deck machinery", "wind-turbine gearbox shafts" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "fretting at the ground set faces of a pair whose clamp torque relaxes in service", "thermal preload runaway in a back-to-back pair when inner-ring heat has nowhere to expand", "PA66 cage embrittlement after sustained running above its 120 °C continuous-temperature ceiling", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 105 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 73xx medium section at 105 mm bore (225×49 mm) is heavier-rated than the 7221 but runs hotter at the same speed; do not substitute a 7321 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "DB (back-to-back) pairs are stiffer against moments, DF (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 7321 mounting error.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7321 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Open 7321 units need application-supplied sealing and a defined lubricant supply; in oil lubrication keep the oil level below the lowest rolling element or churning raises temperature well beyond the catalogue speed figures.", "The 203/193 kN ratings are SKF catalogue 17000 values for the 7321 BEP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7321 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7321 BEP designation when purchasing and match the execution to the mounting arrangement.", "A plain 7321 BEP is a single open bearing, not a universally matchable one; to mount a defined DB/DF pair order the BECBP (CB) execution — pairing two unmatched basic units gives uncontrolled preload because the side faces are not ground for set mounting." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7321?", "a": "The SKF 7321 BEP is a single-row angular-contact ball bearing with 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 203 kN, C0 193 kN, fatigue load limit Pu 6.4 kN, reference speed 3,600 r/min, limiting speed 3,400 r/min, mass about 8550 g. It is an open 40° contact-angle bearing with a PA66 cage. The two speed figures are independent limits and the operating point must clear both." }, { "q": "How does the 7321 bore code work?", "a": "The last two digits of 7321 are bore code 21, so 21 × 5 = 105 mm bore. The 225 mm OD and 49 mm width come from the ISO 15 diameter-series plan, shared with the 6321 deep-groove envelope." }, { "q": "What do the 73xx and BEP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. The plain BEP is the basic open single bearing; BECBP is the universally matchable version. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7321 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. Universally matchable CB executions can be assembled into pairs directly; define the preload class against the load and speed of the position." }, { "q": "How does 7321 compare with a deep-groove 6321?", "a": "Both use the 105×225×49 mm ISO 15 envelope, but the angular-contact 7321 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A 6321 cannot be dropped into a combined-load 7321 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "7321-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7321-BEP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7321 BEP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7321-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7321 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7321-DECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7321 DECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7321 BEP" ], "locale_variants": {} }, { "sku": "7322", "brand": "SKF", "manufacturer_designation": "SKF 7322 BECBP", "series": "7300-series", "type": "angular_contact", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "material": "GCr15", "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "dynamic_load_kN": 240, "static_load_kN": 245, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "7322 is SKF's single-row angular-contact ball bearing in the medium (7300) series of the 7xxx range: an asymmetric-raceway open bearing with a nominal 40° contact angle, listed as 7322 BECBP in the SKF Rolling Bearings catalogue.Digit by digit, 7322 reads as bearing type 7 (single-row angular contact), medium section diameter series 3, and bore reference 22 resolving to 110 mm; 240 mm OD and 50 width are the matching ISO 15 boundary values. The suffix decodes as B for the 40° contact-angle execution, E for SKF's enhanced internal design with larger/fewer balls, and P for the glass-fibre reinforced PA66 ball-centred cage (continuous temperature ceiling 120 °C). CB means the side faces are ground for universal matching with Normal internal axial clearance, which is the starting point for field-set preload rather than a factory-matched fixed-preload set. The 65.0 mm radial section height ((240−110)/2) and 10000 g catalogue mass frame a 110 mm bore bearing rated at 240 kN C — roughly 2.18 kN of dynamic capacity per millimetre of bore before application factors. A single 7322 locates the shaft in one axial direction only; for bidirectional location order a matched pair — DB for moment stiffness, DF for tolerance of thermal expansion — and size the preload against the real load and speed of the position.", "applications": [ "marine propulsion and deck machinery", "wind-turbine gearbox shafts", "rolling-mill auxiliary drives", "mineral-processing and crusher drives" ], "failure_modes": [ "contamination wear through the open arrangement when no external seal is provided", "raceway smearing under marginal lubrication at start-up before oil reaches the contact ellipse", "raceway spalling from axial overload beyond the single-direction thrust rating", "false brinelling on idle paired sets exposed to machine vibration", "cage wear from speed beyond the catalogue limiting value with thin or aged lubricant", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "At 110 mm bore the ring mass is high enough that cocking during mounting damages the cage and race lips; guide the ring square, confirm seat contact around the full circumference, and re-check preload after the first thermal cycle of the paired set.", "The 73xx medium section at 110 mm bore (240×50 mm) is heavier-rated than the 7222 but runs hotter at the same speed; do not substitute a 7322 into a 72-series spindle position without re-checking dn, lubricant film and preload.", "The 40° contact angle creates an induced axial load under pure radial force; include it in the 7322 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its balls.", "Preload is a design value, not an assembly feel: excessive preload in the 7322 pair raises operating temperature and can trigger thermal runaway back-to-back, while too little lets the balls skid and smear the raceway under light load.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 240/245 kN ratings are SKF catalogue 17000 values for the 7322 BECBP execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 7322 (BEP basic, BECBP universally matchable, BE-2RZP sealed, BECBM brass-cage, ACC-series at 25°); they are not interchangeable order numbers — quote the full 7322 BECBP designation when purchasing and match the execution to the mounting arrangement.", "The CB execution (7322 BECBP) ships prepared for pair mounting but is not a matched set by itself: preload results from how the pair is clamped, so follow the SKF stand-off-ring and nut-torque procedure rather than assuming the bearings arrive preloaded." ], "faq": [ { "q": "What are the dimensions and catalogue data of SKF 7322?", "a": "The SKF 7322 BECBP is a single-row angular-contact ball bearing with 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in) per ISO 15. From SKF catalogue 17000: basic dynamic load rating C 240 kN, C0 245 kN, fatigue load limit Pu 7.8 kN, reference speed 3,400 r/min, limiting speed 3,600 r/min, mass about 10000 g. It is an open 40° contact-angle bearing with a PA66 cage. Here the 3,400 r/min value is the one to design against." }, { "q": "How does the 7322 bore code work?", "a": "The last two digits of 7322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 50 mm width come from the ISO 15 diameter-series plan, shared with the 6322 deep-groove envelope." }, { "q": "What do the 73xx and BECBP designations mean?", "a": "The leading 7 marks a single-row angular-contact bearing; the second digit 3 is the ISO diameter series (medium section). In the SKF suffix, B denotes the 40° contact angle, E the enhanced internal design, P the glass-fibre PA66 cage. CB adds Normal axial clearance with ground faces for universal DB/DF/DT pair mounting. A 25° variant (suffix A, e.g. ACC) runs faster but carries less thrust." }, { "q": "Can a single 7322 take axial load in both directions?", "a": "No — one single-row angular-contact bearing reacts thrust in one direction only, and under radial load its 40° contact angle induces an axial force. Use two bearings as a matched pair: DB (back-to-back) for a rigid, moment-resisting arrangement, DF (face-to-face) where thermal expansion must be tolerated, or DT (tandem) where one-direction thrust is shared. A CB (universal) execution arrives with ground side faces for set mounting; basic BEP bearings are single units and are not ground for arbitrary pairing." }, { "q": "How does 7322 compare with a deep-groove 6322?", "a": "Both use the 110×240×50 mm ISO 15 envelope, but the angular-contact 7322 has an asymmetric raceway at a nominal 40° angle: higher combined axial-plus-radial capacity and controlled preload, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. The shared outline is why the two types cross-reference each other in catalogues, but ratings at 240 kN C apply only to the angular-contact design shown here." } ], "cross_ref": [ { "equiv_sku": "7322-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "7322-BEY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7322 BEY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7322-BEM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7322 BEM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7322-BECBP", "equiv_brand": "SKF", "level": "full", "note": "SKF 7322 BECBP (glass-fibre PA66 cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7322-BECBY", "equiv_brand": "SKF", "level": "full", "note": "SKF 7322 BECBY (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "7322-BECBM", "equiv_brand": "SKF", "level": "full", "note": "SKF 7322 BECBM (brass cage, open arrangement) is the same-envelope execution with ratings within 10 % — boundary dimensions interchangeable." }, { "equiv_sku": "QJ-322-N2MA", "equiv_brand": "SKF", "level": "partial", "note": "SKF QJ 322 N2MA shares the envelope but catalogue C/C0 differ — envelope match only after a load check." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 3.1 single-row ACBB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "7322 BECBP" ], "locale_variants": {} }, { "sku": "30204", "brand": "SKF", "manufacturer_designation": "SKF 30204", "series": "30200-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 47, "B_mm": 15.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 120, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 34.1, "static_load_kN": 28, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 20 mm shaft carrying combined load, SKF lists 30204 under catalogue execution SKF 30204: one open single-row tapered roller bearing in the standard section of the 30200 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 0 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 20 mm bore; the 47 mm OD and 15.25 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.82 (static 28 kN against dynamic 34.1 kN), typical of a tapered roller sized for axial capacity, and the 3 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting practice for 30204: the rotating cone takes the interference fit (k5 on a 20 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts", "steering knuckles and small differentials" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30204 shows up as gearbox vibration long before it fails.", "The 302 series at 20 mm bore (47×15.25 mm) is the standard tapered-roller envelope; stepping to a 32204 or 32304 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix brands or executions inside one 30204 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "A single 30204 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Shaft and housing fillets must clear the bearing chamfer so the 15.25 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 34.1/28 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30204 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30204 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30204?", "a": "The SKF 30204 is a single-row tapered roller bearing with 20 mm bore, 47 mm outer diameter and 15.25 mm width (0.787 × 1.85 × 0.6 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 34.1 kN, C0 28 kN, fatigue load limit Pu 3 kN, reference speed 12,000 r/min, limiting speed 15,000 r/min, mass about 120 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30204 bore code work?", "a": "The last two digits of 30204 are bore code 04, so 04 × 5 = 20 mm bore. The 47 mm OD and 15.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30204 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30204 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30204 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30204 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30204-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×47×15.25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "30204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30204" ], "locale_variants": {} }, { "sku": "30205", "brand": "SKF", "manufacturer_designation": "SKF 30205", "series": "30200-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 52, "B_mm": 16.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 150, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 38.1, "static_load_kN": 33.5, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 11000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 30205 (SKF 30205) is the standard section tapered roller choice for a 25 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 52×16.25 mm ISO 355 envelope.Digit by digit, 30205 reads as bearing type 3 (single-row tapered roller), standard section series 0, and bore reference 05 resolving to 25 mm; 52 mm OD and 16.25 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 13.5 mm radial section height ((52−25)/2) and 150 g catalogue mass frame a 25 mm bore bearing rated at 38.1 kN C — roughly 1.52 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating cone — and two 30205 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "electric-motor pinion shafts", "steering knuckles and small differentials", "agricultural implement hubs", "small conveyor drive pulleys" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30205 shows up as gearbox vibration long before it fails.", "The 302 series at 25 mm bore (52×16.25 mm) is the standard tapered-roller envelope; stepping to a 32205 or 32305 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30205 mounting error.", "At the 38.1 kN rating of 30205, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 13,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Catalogue reference speed and limiting speed are different limits: the 11,000 r/min reference is a thermal criterion under load, while the 13,000 r/min limiting value is the mechanical ceiling — observe both.", "The 38.1/33.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30205 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30205 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30205?", "a": "The SKF 30205 is a single-row tapered roller bearing with 25 mm bore, 52 mm outer diameter and 16.25 mm width (0.984 × 2.047 × 0.64 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 38.1 kN, C0 33.5 kN, fatigue load limit Pu 3.45 kN, reference speed 11,000 r/min, limiting speed 13,000 r/min, mass about 150 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30205 bore code work?", "a": "The last two digits of 30205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 16.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30205 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30205 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30205 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30205 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30205-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30205" ], "locale_variants": {} }, { "sku": "30206", "brand": "SKF", "manufacturer_designation": "SKF 30206", "series": "30200-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 62, "B_mm": 17.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 230, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 50, "static_load_kN": 44, "fatigue_load_limit_kN": 4.8, "reference_speed_rpm": 9000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 30206 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 30 mm shaft, standard section, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 30206 means tapered-roller type 3, standard section series 0, 30 mm bore — which is why the 62×17.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 230 g for the 30×62×17.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. A single 30206 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30206 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 30 mm bore (62×17.25 mm) is the standard tapered-roller envelope; stepping to a 32206 or 32306 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30206 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30206 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 30206 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 50/44 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30206 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30206 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30206?", "a": "The SKF 30206 is a single-row tapered roller bearing with 30 mm bore, 62 mm outer diameter and 17.25 mm width (1.181 × 2.441 × 0.679 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 50 kN, C0 44 kN, fatigue load limit Pu 4.8 kN, reference speed 9,000 r/min, limiting speed 11,000 r/min, mass about 230 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30206 bore code work?", "a": "The last two digits of 30206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 17.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30206 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30206 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30206 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30206 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30206-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30206" ], "locale_variants": {} }, { "sku": "30207", "brand": "SKF", "manufacturer_designation": "SKF 30207", "series": "30200-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 72, "B_mm": 18.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 330, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 63.2, "static_load_kN": 56, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "30207 is a single-row tapered roller bearing in the ISO 30200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 30207 follows the ISO 355 convention: 3 for the tapered-roller type, 0 for the standard section, final digits 07 for the 35 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 8,000 r/min reference speed the 18.5 mm-section 30207 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 9,500 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30207 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30207 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 35 mm bore (72×18.25 mm) is the standard tapered-roller envelope; stepping to a 32207 or 32307 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Setting is a design value, not an assembly feel: excessive preload in the 30207 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Do not mix brands or executions inside one 30207 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 72 mm cup race release as noise within the first running hours.", "The 63.2/56 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30207 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30207 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30207?", "a": "The SKF 30207 is a single-row tapered roller bearing with 35 mm bore, 72 mm outer diameter and 18.25 mm width (1.378 × 2.835 × 0.719 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 63.2 kN, C0 56 kN, fatigue load limit Pu 6.1 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 330 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30207 bore code work?", "a": "The last two digits of 30207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 18.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30207 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30207 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30207 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30207 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30207-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30207" ], "locale_variants": {} }, { "sku": "30208", "brand": "SKF", "manufacturer_designation": "SKF 30208", "series": "30200-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 80, "B_mm": 19.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 420, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 75.8, "static_load_kN": 68, "fatigue_load_limit_kN": 7.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 30208 is a 40×80×19.75 mm single-row tapered roller bearing — the standard section entry in the 30200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.The code breaks down as type prefix 3 (tapered roller), series 0 (the standard section), and bore code 08 = 40 mm; dimensions 40×80×19.75 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 7,000 r/min thermal reference and 8,500 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30208 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30208 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 40 mm bore (80×19.75 mm) is the standard tapered-roller envelope; stepping to a 32208 or 32308 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "A single 30208 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30208 mounting error.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 75.8/68 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30208 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30208 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30208?", "a": "The SKF 30208 is a single-row tapered roller bearing with 40 mm bore, 80 mm outer diameter and 19.75 mm width (1.575 × 3.15 × 0.778 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 75.8 kN, C0 68 kN, fatigue load limit Pu 7.65 kN, reference speed 7,000 r/min, limiting speed 8,500 r/min, mass about 420 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30208 bore code work?", "a": "The last two digits of 30208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 19.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30208 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30208 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30208 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30208 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×19.75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "30208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "30208R", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30208" ], "locale_variants": {} }, { "sku": "30209", "brand": "SKF", "manufacturer_designation": "SKF 30209", "series": "30200-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 85, "B_mm": 20.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 470, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 81.6, "static_load_kN": 76.5, "fatigue_load_limit_kN": 8.65, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30209 appears as SKF 30209: an open, single-row tapered roller bearing in the standard section of the 30200 dimension series, supplied with a pressed-steel cage as standard.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 0 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 45 mm bore; the 85 mm OD and 20.75 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 81.6 kN and C0 76.5 kN, the 30209 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 8,000 r/min. Because the contact line is tapered, one 30209 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 45 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30209 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 45 mm bore (85×20.75 mm) is the standard tapered-roller envelope; stepping to a 32209 or 32309 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 81.6 kN rating of 30209, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30209 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 470 g mass and 20.75 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 30209.", "The 81.6/76.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30209 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30209 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30209?", "a": "The SKF 30209 is a single-row tapered roller bearing with 45 mm bore, 85 mm outer diameter and 20.75 mm width (1.772 × 3.346 × 0.817 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 81.6 kN, C0 76.5 kN, fatigue load limit Pu 8.65 kN, reference speed 6,300 r/min, limiting speed 8,000 r/min, mass about 470 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30209 bore code work?", "a": "The last two digits of 30209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 20.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30209 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30209 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30209 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30209 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30209-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30209" ], "locale_variants": {} }, { "sku": "30210", "brand": "SKF", "manufacturer_designation": "SKF 30210", "series": "30200-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 90, "B_mm": 21.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 540, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 93.1, "static_load_kN": 91.5, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 30210 belongs to the SKF single-row tapered roller range — the 50 mm bore entry in the 30200 series, dimensioned 90 mm OD and 21.75 mm wide to the ISO 355 boundary plan.On the SKF nameplate, 30210 follows the ISO 355 convention: 3 for the tapered-roller type, 0 for the standard section, final digits 10 for the 50 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.98 (static 91.5 kN against dynamic 93.1 kN), typical of a tapered roller sized for axial capacity, and the 10.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 30210 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30210 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 50 mm bore (90×21.75 mm) is the standard tapered-roller envelope; stepping to a 32210 or 32310 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 93.1 kN rating of 30210, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 7,500 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30210 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 6,000 r/min reference is a thermal criterion under load, while the 7,500 r/min limiting value is the mechanical ceiling — observe both.", "The 93.1/91.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30210 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30210 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30210?", "a": "The SKF 30210 is a single-row tapered roller bearing with 50 mm bore, 90 mm outer diameter and 21.75 mm width (1.969 × 3.543 × 0.856 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93.1 kN, C0 91.5 kN, fatigue load limit Pu 10.4 kN, reference speed 6,000 r/min, limiting speed 7,500 r/min, mass about 540 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30210 bore code work?", "a": "The last two digits of 30210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 21.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30210 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30210 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30210 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30210 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30210-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30210" ], "locale_variants": {} }, { "sku": "30211", "brand": "SKF", "manufacturer_designation": "SKF 30211", "series": "30200-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 100, "B_mm": 22.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 700, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 111, "static_load_kN": 106, "fatigue_load_limit_kN": 12, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 55 mm shaft carrying combined load, SKF lists 30211 under catalogue execution SKF 30211: one open single-row tapered roller bearing in the standard section of the 30200 family.The code breaks down as type prefix 3 (tapered roller), series 0 (the standard section), and bore code 11 = 55 mm; dimensions 55×100×22.75 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 22.5 mm radial section height ((100−55)/2) and 700 g catalogue mass frame a 55 mm bore bearing rated at 111 kN C — roughly 2.02 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30211 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30211 pair heats, loses setting control and smears the roller-rib contact.", "The 302 series at 55 mm bore (100×22.75 mm) is the standard tapered-roller envelope; stepping to a 32211 or 32311 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30211 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30211 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 30211 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 111/106 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30211 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30211 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30211?", "a": "The SKF 30211 is a single-row tapered roller bearing with 55 mm bore, 100 mm outer diameter and 22.75 mm width (2.165 × 3.937 × 0.896 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 111 kN, C0 106 kN, fatigue load limit Pu 12 kN, reference speed 5,300 r/min, limiting speed 6,700 r/min, mass about 700 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30211 bore code work?", "a": "The last two digits of 30211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 22.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30211 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30211 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30211 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30211 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30211-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30211" ], "locale_variants": {} }, { "sku": "30212", "brand": "SKF", "manufacturer_designation": "SKF 30212", "series": "30200-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 110, "B_mm": 23.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 880, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 120, "static_load_kN": 114, "fatigue_load_limit_kN": 13.2, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 30212 (SKF 30212) is the standard section tapered roller choice for a 60 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 110×23.75 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 0 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 60 mm bore; the 110 mm OD and 23.75 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 880 g for the 60×110×23.75 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30212 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 60 mm bore 30212 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 60 mm bore (110×23.75 mm) is the standard tapered-roller envelope; stepping to a 32212 or 32312 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix brands or executions inside one 30212 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Setting is a design value, not an assembly feel: excessive preload in the 30212 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 110 mm cup race release as noise within the first running hours.", "The 120/114 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30212 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30212 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30212?", "a": "The SKF 30212 is a single-row tapered roller bearing with 60 mm bore, 110 mm outer diameter and 23.75 mm width (2.362 × 4.331 × 0.935 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 120 kN, C0 114 kN, fatigue load limit Pu 13.2 kN, reference speed 5,000 r/min, limiting speed 6,000 r/min, mass about 880 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30212 bore code work?", "a": "The last two digits of 30212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 23.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30212 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30212 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30212 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30212 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30212-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30212" ], "locale_variants": {} }, { "sku": "30213", "brand": "SKF", "manufacturer_designation": "SKF 30213", "series": "30200-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 120, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 141, "static_load_kN": 134, "fatigue_load_limit_kN": 16.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 30213 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 65 mm shaft, standard section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 30213 reads as bearing type 3 (single-row tapered roller), standard section series 0, and bore reference 13 resolving to 65 mm; 120 mm OD and 24.75 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 4,500 r/min reference speed the 27.5 mm-section 30213 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,600 r/min as the mechanical ceiling. Because the contact line is tapered, one 30213 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 65 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 65 mm bore 30213 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 65 mm bore (120×24.75 mm) is the standard tapered-roller envelope; stepping to a 32213 or 32313 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30213 mounting error.", "A single 30213 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 141/134 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30213 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30213 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30213?", "a": "The SKF 30213 is a single-row tapered roller bearing with 65 mm bore, 120 mm outer diameter and 24.75 mm width (2.559 × 4.724 × 0.974 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 141 kN, C0 134 kN, fatigue load limit Pu 16.3 kN, reference speed 4,500 r/min, limiting speed 5,600 r/min, mass about 1100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30213 bore code work?", "a": "The last two digits of 30213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 24.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30213 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30213 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30213 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30213 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30213-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30213" ], "locale_variants": {} }, { "sku": "30214", "brand": "SKF", "manufacturer_designation": "SKF 30214", "series": "30200-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 125, "B_mm": 26.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 155, "static_load_kN": 156, "fatigue_load_limit_kN": 18, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "30214 is a single-row tapered roller bearing in the ISO 30200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Numbering ties the bearing to its envelope: 30214 means tapered-roller type 3, standard section series 0, 70 mm bore — which is why the 125×26.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 5,300 r/min mechanical limiting speed. For a 70 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 30214 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 70 mm bore 30214 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 70 mm bore (125×26.25 mm) is the standard tapered-roller envelope; stepping to a 32214 or 32314 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30214 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 155 kN rating of 30214, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "The 1250 g mass and 26.25 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 30214.", "The 155/156 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30214 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30214 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30214?", "a": "The SKF 30214 is a single-row tapered roller bearing with 70 mm bore, 125 mm outer diameter and 26.25 mm width (2.756 × 4.921 × 1.033 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 155 kN, C0 156 kN, fatigue load limit Pu 18 kN, reference speed 4,300 r/min, limiting speed 5,300 r/min, mass about 1250 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30214 bore code work?", "a": "The last two digits of 30214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 26.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30214 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30214 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30214 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30214 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30214-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30214" ], "locale_variants": {} }, { "sku": "30215", "brand": "SKF", "manufacturer_designation": "SKF 30215", "series": "30200-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 130, "B_mm": 27.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 171, "static_load_kN": 176, "fatigue_load_limit_kN": 20.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 30215 is a 75×130×27.25 mm single-row tapered roller bearing — the standard section entry in the 30200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 30215 follows the ISO 355 convention: 3 for the tapered-roller type, 0 for the standard section, final digits 15 for the 75 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 171 kN and C0 176 kN, the 30215 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 5,000 r/min. Mounting practice for 30215: the rotating cone takes the interference fit (k5 on a 75 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 75 mm bore 30215 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 75 mm bore (130×27.25 mm) is the standard tapered-roller envelope; stepping to a 32215 or 32315 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Setting is a design value, not an assembly feel: excessive preload in the 30215 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30215 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Open 30215 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 171/176 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30215 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30215 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30215?", "a": "The SKF 30215 is a single-row tapered roller bearing with 75 mm bore, 130 mm outer diameter and 27.25 mm width (2.953 × 5.118 × 1.073 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 171 kN, C0 176 kN, fatigue load limit Pu 20.4 kN, reference speed 4,000 r/min, limiting speed 5,000 r/min, mass about 1400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30215 bore code work?", "a": "The last two digits of 30215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 27.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30215 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30215 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30215 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30215 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×27.25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "30215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30215" ], "locale_variants": {} }, { "sku": "30216", "brand": "SKF", "manufacturer_designation": "SKF 30216", "series": "30200-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 140, "B_mm": 28.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1600, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 184, "static_load_kN": 183, "fatigue_load_limit_kN": 21.2, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30216 appears as SKF 30216: an open, single-row tapered roller bearing in the standard section of the 30200 dimension series, supplied with a pressed-steel cage as standard.The code breaks down as type prefix 3 (tapered roller), series 0 (the standard section), and bore code 16 = 80 mm; dimensions 80×140×28.25 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 21.2 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.99 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 30216 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 80 mm bore 30216 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 80 mm bore (140×28.25 mm) is the standard tapered-roller envelope; stepping to a 32216 or 32316 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "A single 30216 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Do not mix brands or executions inside one 30216 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 28.25 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 184/183 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30216 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30216 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30216?", "a": "The SKF 30216 is a single-row tapered roller bearing with 80 mm bore, 140 mm outer diameter and 28.25 mm width (3.15 × 5.512 × 1.112 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 184 kN, C0 183 kN, fatigue load limit Pu 21.2 kN, reference speed 3,800 r/min, limiting speed 4,800 r/min, mass about 1600 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30216 bore code work?", "a": "The last two digits of 30216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 28.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30216 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30216 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30216 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30216 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30216" ], "locale_variants": {} }, { "sku": "30217", "brand": "SKF", "manufacturer_designation": "SKF 30217", "series": "30200-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 150, "B_mm": 30.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2050, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 216, "static_load_kN": 220, "fatigue_load_limit_kN": 25.5, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 30217 belongs to the SKF single-row tapered roller range — the 85 mm bore entry in the 30200 series, dimensioned 150 mm OD and 30.5 mm wide to the ISO 355 boundary plan.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 0 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 85 mm bore; the 150 mm OD and 30.5 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.02 (static 220 kN against dynamic 216 kN), typical of a tapered roller sized for axial capacity, and the 25.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 30217 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 85 mm bore 30217 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 85 mm bore (150×30.5 mm) is the standard tapered-roller envelope; stepping to a 32217 or 32317 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "At the 216 kN rating of 30217, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,300 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30217 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 3,600 r/min reference is a thermal criterion under load, while the 4,300 r/min limiting value is the mechanical ceiling — observe both.", "The 216/220 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30217 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30217 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30217?", "a": "The SKF 30217 is a single-row tapered roller bearing with 85 mm bore, 150 mm outer diameter and 30.5 mm width (3.346 × 5.906 × 1.201 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 216 kN, C0 220 kN, fatigue load limit Pu 25.5 kN, reference speed 3,600 r/min, limiting speed 4,300 r/min, mass about 2050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30217 bore code work?", "a": "The last two digits of 30217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 30.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30217 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30217 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30217 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30217 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30217" ], "locale_variants": {} }, { "sku": "30218", "brand": "SKF", "manufacturer_designation": "SKF 30218", "series": "30200-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 160, "B_mm": 32.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2500, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 240, "static_load_kN": 245, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 90 mm shaft carrying combined load, SKF lists 30218 under catalogue execution SKF 30218: one open single-row tapered roller bearing in the standard section of the 30200 family.Digit by digit, 30218 reads as bearing type 3 (single-row tapered roller), standard section series 0, and bore reference 18 resolving to 90 mm; 160 mm OD and 32.5 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 35.0 mm radial section height ((160−90)/2) and 2500 g catalogue mass frame a 90 mm bore bearing rated at 240 kN C — roughly 2.67 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30218 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 90 mm bore 30218 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 90 mm bore (160×32.5 mm) is the standard tapered-roller envelope; stepping to a 32218 or 32318 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30218 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30218 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 30218 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 240/245 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30218 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30218 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30218?", "a": "The SKF 30218 is a single-row tapered roller bearing with 90 mm bore, 160 mm outer diameter and 32.5 mm width (3.543 × 6.299 × 1.28 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 240 kN, C0 245 kN, fatigue load limit Pu 28.5 kN, reference speed 3,400 r/min, limiting speed 4,000 r/min, mass about 2500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30218 bore code work?", "a": "The last two digits of 30218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 32.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30218 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30218 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30218 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30218 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30218" ], "locale_variants": {} }, { "sku": "30219", "brand": "SKF", "manufacturer_designation": "SKF 30219", "series": "30200-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 170, "B_mm": 34.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3000, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 266, "static_load_kN": 275, "fatigue_load_limit_kN": 31.5, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 30219 (SKF 30219) is the standard section tapered roller choice for a 95 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 170×34.5 mm ISO 355 envelope.Numbering ties the bearing to its envelope: 30219 means tapered-roller type 3, standard section series 0, 95 mm bore — which is why the 170×34.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 3000 g for the 95×170×34.5 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30219 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 95 mm bore 30219 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 95 mm bore (170×34.5 mm) is the standard tapered-roller envelope; stepping to a 32219 or 32319 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix brands or executions inside one 30219 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Setting is a design value, not an assembly feel: excessive preload in the 30219 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 170 mm cup race release as noise within the first running hours.", "The 266/275 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30219 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30219 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30219?", "a": "The SKF 30219 is a single-row tapered roller bearing with 95 mm bore, 170 mm outer diameter and 34.5 mm width (3.74 × 6.693 × 1.358 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 266 kN, C0 275 kN, fatigue load limit Pu 31.5 kN, reference speed 3,200 r/min, limiting speed 3,800 r/min, mass about 3000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30219 bore code work?", "a": "The last two digits of 30219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 34.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30219 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30219 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30219 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30219 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30219" ], "locale_variants": {} }, { "sku": "30220", "brand": "SKF", "manufacturer_designation": "SKF 30220", "series": "30200-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 180, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3650, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 304, "static_load_kN": 320, "fatigue_load_limit_kN": 36, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 30220 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 100 mm shaft, standard section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 0 is the ISO 355 diameter/width series (standard section), and the last two digits encode the 100 mm bore; the 180 mm OD and 37 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 3,000 r/min thermal reference and 3,600 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 30220 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 100 mm bore 30220 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 100 mm bore (180×37 mm) is the standard tapered-roller envelope; stepping to a 32220 or 32320 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Do not mix brands or executions inside one 30220 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30220 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Open 30220 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 304/320 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30220 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30220 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30220?", "a": "The SKF 30220 is a single-row tapered roller bearing with 100 mm bore, 180 mm outer diameter and 37 mm width (3.937 × 7.087 × 1.457 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 304 kN, C0 320 kN, fatigue load limit Pu 36 kN, reference speed 3,000 r/min, limiting speed 3,600 r/min, mass about 3650 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30220 bore code work?", "a": "The last two digits of 30220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 37 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30220 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30220 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30220 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30220 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30220" ], "locale_variants": {} }, { "sku": "30221", "brand": "SKF", "manufacturer_designation": "SKF 30221", "series": "30200-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 190, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 4300, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 333, "static_load_kN": 355, "fatigue_load_limit_kN": 40, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "30221 is a single-row tapered roller bearing in the ISO 30200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Digit by digit, 30221 reads as bearing type 3 (single-row tapered roller), standard section series 0, and bore reference 21 resolving to 105 mm; 190 mm OD and 39 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 333 kN and C0 355 kN, the 30221 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,400 r/min. A single 30221 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 105 mm bore 30221 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 105 mm bore (190×39 mm) is the standard tapered-roller envelope; stepping to a 32221 or 32321 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30221 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 30221 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 333/355 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30221 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30221 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30221?", "a": "The SKF 30221 is a single-row tapered roller bearing with 105 mm bore, 190 mm outer diameter and 39 mm width (4.134 × 7.48 × 1.535 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 333 kN, C0 355 kN, fatigue load limit Pu 40 kN, reference speed 2,800 r/min, limiting speed 3,400 r/min, mass about 4300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30221 bore code work?", "a": "The last two digits of 30221 are bore code 21, so 21 × 5 = 105 mm bore. The 190 mm OD and 39 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30221 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30221 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30221 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30221 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30221", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30221" ], "locale_variants": {} }, { "sku": "30222", "brand": "SKF", "manufacturer_designation": "SKF 30222", "series": "30200-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 200, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 5050, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 327, "static_load_kN": 405, "fatigue_load_limit_kN": 43, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 30222 is a 110×200×41 mm single-row tapered roller bearing — the standard section entry in the 30200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 30222 means tapered-roller type 3, standard section series 0, 110 mm bore — which is why the 200×41 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 43 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.24 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30222 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 110 mm bore 30222 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 302 series at 110 mm bore (200×41 mm) is the standard tapered-roller envelope; stepping to a 32222 or 32322 changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30222 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "A single 30222 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Catalogue reference speed and limiting speed are different limits: the 2,600 r/min reference is a thermal criterion under load, while the 3,200 r/min limiting value is the mechanical ceiling — observe both.", "The 327/405 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30222 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30222 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30222?", "a": "The SKF 30222 is a single-row tapered roller bearing with 110 mm bore, 200 mm outer diameter and 41 mm width (4.331 × 7.874 × 1.614 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 327 kN, C0 405 kN, fatigue load limit Pu 43 kN, reference speed 2,600 r/min, limiting speed 3,200 r/min, mass about 5050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30222 bore code work?", "a": "The last two digits of 30222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 41 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30222 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 0 is the ISO 355 series (standard section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30222 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30222 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30222 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30222" ], "locale_variants": {} }, { "sku": "32304", "brand": "SKF", "manufacturer_designation": "SKF 32304", "series": "32300-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 52, "B_mm": 22.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 230, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 54.3, "static_load_kN": 45.5, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 11000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 32304 appears as SKF 32304: an open, single-row tapered roller bearing in the extra-heavy section of the 32300 dimension series, supplied with a pressed-steel cage as standard.On the SKF nameplate, 32304 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the extra-heavy section, final digits 04 for the 20 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 54.3 kN and C0 45.5 kN, the 32304 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 14,000 r/min. Fit selection follows the rotating ring — interference on a rotating cone — and two 32304 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "steering knuckles and small differentials", "agricultural implement hubs", "small conveyor drive pulleys", "power-tool gear heads" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32304 shows up as gearbox vibration long before it fails.", "The 323 series at 20 mm bore (52×22.25 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30204, so recalculate dn and lubricant film before substitution.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32304 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Do not mix brands or executions inside one 32304 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 22.25 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 54.3/45.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32304 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32304 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32304?", "a": "The SKF 32304 is a single-row tapered roller bearing with 20 mm bore, 52 mm outer diameter and 22.25 mm width (0.787 × 2.047 × 0.876 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 54.3 kN, C0 45.5 kN, fatigue load limit Pu 5 kN, reference speed 11,000 r/min, limiting speed 14,000 r/min, mass about 230 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32304 bore code work?", "a": "The last two digits of 32304 are bore code 04, so 04 × 5 = 20 mm bore. The 52 mm OD and 22.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32304 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32304 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32304 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32304 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32304-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32304" ], "locale_variants": {} }, { "sku": "32305", "brand": "SKF", "manufacturer_designation": "SKF 32305", "series": "32300-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 62, "B_mm": 25.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 360, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 74.1, "static_load_kN": 63, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 9000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32305 belongs to the SKF single-row tapered roller range — the 25 mm bore entry in the 32300 series, dimensioned 62 mm OD and 25.25 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 2 (the extra-heavy section), and bore code 05 = 25 mm; dimensions 25×62×25.25 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 7.1 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.85 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. A single 32305 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "small conveyor drive pulleys", "power-tool gear heads", "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32305 shows up as gearbox vibration long before it fails.", "The 323 series at 25 mm bore (62×25.25 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30205, so recalculate dn and lubricant film before substitution.", "Do not mix brands or executions inside one 32305 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32305 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 9,000 r/min reference is a thermal criterion under load, while the 12,000 r/min limiting value is the mechanical ceiling — observe both.", "The 74.1/63 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32305 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32305 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32305?", "a": "The SKF 32305 is a single-row tapered roller bearing with 25 mm bore, 62 mm outer diameter and 25.25 mm width (0.984 × 2.441 × 0.994 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 74.1 kN, C0 63 kN, fatigue load limit Pu 7.1 kN, reference speed 9,000 r/min, limiting speed 12,000 r/min, mass about 360 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32305 bore code work?", "a": "The last two digits of 32305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 25.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32305 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32305 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32305 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32305 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32305-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32305" ], "locale_variants": {} }, { "sku": "32306", "brand": "SKF", "manufacturer_designation": "SKF 32306", "series": "32300-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 72, "B_mm": 28.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 550, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 95, "static_load_kN": 85, "fatigue_load_limit_kN": 9.65, "reference_speed_rpm": 7500, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 30 mm shaft carrying combined load, SKF lists 32306 under catalogue execution SKF 32306: one open single-row tapered roller bearing in the extra-heavy section of the 32300 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (extra-heavy section), and the last two digits encode the 30 mm bore; the 72 mm OD and 28.75 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.89 (static 85 kN against dynamic 95 kN), typical of a tapered roller sized for axial capacity, and the 9.65 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32306 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32306 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 30 mm bore (72×28.75 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30206, so recalculate dn and lubricant film before substitution.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32306 mounting error.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32306 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 32306 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 95/85 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32306 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32306 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32306?", "a": "The SKF 32306 is a single-row tapered roller bearing with 30 mm bore, 72 mm outer diameter and 28.75 mm width (1.181 × 2.835 × 1.132 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 95 kN, C0 85 kN, fatigue load limit Pu 9.65 kN, reference speed 7,500 r/min, limiting speed 10,000 r/min, mass about 550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32306 bore code work?", "a": "The last two digits of 32306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 28.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32306 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32306 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32306 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32306 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32306-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32306" ], "locale_variants": {} }, { "sku": "32307", "brand": "SKF", "manufacturer_designation": "SKF 32307", "series": "32300-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 80, "B_mm": 32.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 750, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 117, "static_load_kN": 106, "fatigue_load_limit_kN": 12.2, "reference_speed_rpm": 6700, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32307 (SKF 32307) is the extra-heavy section tapered roller choice for a 35 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 80×32.75 mm ISO 355 envelope.Digit by digit, 32307 reads as bearing type 3 (single-row tapered roller), extra-heavy section series 2, and bore reference 07 resolving to 35 mm; 80 mm OD and 32.75 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 22.5 mm radial section height ((80−35)/2) and 750 g catalogue mass frame a 35 mm bore bearing rated at 117 kN C — roughly 3.34 kN of dynamic capacity per millimetre of bore before application factors. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32307 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32307 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 35 mm bore (80×32.75 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30207, so recalculate dn and lubricant film before substitution.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32307 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Setting is a design value, not an assembly feel: excessive preload in the 32307 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 80 mm cup race release as noise within the first running hours.", "The 117/106 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32307 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32307 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32307?", "a": "The SKF 32307 is a single-row tapered roller bearing with 35 mm bore, 80 mm outer diameter and 32.75 mm width (1.378 × 3.15 × 1.289 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 117 kN, C0 106 kN, fatigue load limit Pu 12.2 kN, reference speed 6,700 r/min, limiting speed 9,000 r/min, mass about 750 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32307 bore code work?", "a": "The last two digits of 32307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 32.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32307 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32307 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32307 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32307 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32307-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32307" ], "locale_variants": {} }, { "sku": "32308", "brand": "SKF", "manufacturer_designation": "SKF 32308", "series": "32300-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 90, "B_mm": 35.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1050, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 143, "static_load_kN": 140, "fatigue_load_limit_kN": 16, "reference_speed_rpm": 6000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 32308 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 40 mm shaft, extra-heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 32308 means tapered-roller type 3, extra-heavy section series 2, 40 mm bore — which is why the 90×35.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 1050 g for the 40×90×35.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Because the contact line is tapered, one 32308 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 40 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32308 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 40 mm bore (90×35.25 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30208, so recalculate dn and lubricant film before substitution.", "Setting is a design value, not an assembly feel: excessive preload in the 32308 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 32308 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 143/140 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32308 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32308 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32308?", "a": "The SKF 32308 is a single-row tapered roller bearing with 40 mm bore, 90 mm outer diameter and 35.25 mm width (1.575 × 3.543 × 1.388 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 143 kN, C0 140 kN, fatigue load limit Pu 16 kN, reference speed 6,000 r/min, limiting speed 8,000 r/min, mass about 1050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32308 bore code work?", "a": "The last two digits of 32308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 35.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32308 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32308 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32308 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32308 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32308" ], "locale_variants": {} }, { "sku": "32309", "brand": "SKF", "manufacturer_designation": "SKF 32309", "series": "32300-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 100, "B_mm": 38.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 173, "static_load_kN": 170, "fatigue_load_limit_kN": 20.4, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32309 is a single-row tapered roller bearing in the ISO 32300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 32309 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the extra-heavy section, final digits 09 for the 45 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 5,300 r/min reference speed the 27.5 mm-section 32309 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 7,000 r/min as the mechanical ceiling. For a 45 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32309 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32309 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 45 mm bore (100×38.25 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30209, so recalculate dn and lubricant film before substitution.", "A single 32309 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "At the 173 kN rating of 32309, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 7,000 r/min speed end and heavier preload only where moment stiffness dominates.", "The 1400 g mass and 38.25 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32309.", "The 173/170 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32309 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32309 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32309?", "a": "The SKF 32309 is a single-row tapered roller bearing with 45 mm bore, 100 mm outer diameter and 38.25 mm width (1.772 × 3.937 × 1.506 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 173 kN, C0 170 kN, fatigue load limit Pu 20.4 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 1400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32309 bore code work?", "a": "The last two digits of 32309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 38.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32309 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32309 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32309 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32309 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "32309BR", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32309" ], "locale_variants": {} }, { "sku": "32310", "brand": "SKF", "manufacturer_designation": "SKF 32310", "series": "32300-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 110, "B_mm": 42.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1850, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 211, "static_load_kN": 212, "fatigue_load_limit_kN": 24, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 32310 is a 50×110×42.25 mm single-row tapered roller bearing — the extra-heavy section entry in the 32300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Digit by digit, 32310 reads as bearing type 3 (single-row tapered roller), extra-heavy section series 2, and bore reference 10 resolving to 50 mm; 110 mm OD and 42.25 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 211 kN and C0 212 kN, the 32310 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 6,300 r/min. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32310 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32310 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 50 mm bore (110×42.25 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30210, so recalculate dn and lubricant film before substitution.", "A single 32310 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "A single 32310 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Catalogue reference speed and limiting speed are different limits: the 4,800 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 211/212 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32310 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32310 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32310?", "a": "The SKF 32310 is a single-row tapered roller bearing with 50 mm bore, 110 mm outer diameter and 42.25 mm width (1.969 × 4.331 × 1.663 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 211 kN, C0 212 kN, fatigue load limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32310 bore code work?", "a": "The last two digits of 32310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 42.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32310 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32310 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32310 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32310 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32310" ], "locale_variants": {} }, { "sku": "32311", "brand": "SKF", "manufacturer_designation": "SKF 32311", "series": "32300-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 120, "B_mm": 45.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2350, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 245, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 32311 appears as SKF 32311: an open, single-row tapered roller bearing in the extra-heavy section of the 32300 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 32311 means tapered-roller type 3, extra-heavy section series 2, 55 mm bore — which is why the 120×45.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 28.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.02 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32311 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32311 pair heats, loses setting control and smears the roller-rib contact.", "The 323 series at 55 mm bore (120×45.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30211, so recalculate dn and lubricant film before substitution.", "At the 245 kN rating of 32311, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,600 r/min speed end and heavier preload only where moment stiffness dominates.", "At the 245 kN rating of 32311, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,600 r/min speed end and heavier preload only where moment stiffness dominates.", "The 32311 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 245/250 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32311 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32311 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32311?", "a": "The SKF 32311 is a single-row tapered roller bearing with 55 mm bore, 120 mm outer diameter and 45.5 mm width (2.165 × 4.724 × 1.791 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 245 kN, C0 250 kN, fatigue load limit Pu 28.5 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 2350 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32311 bore code work?", "a": "The last two digits of 32311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 45.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32311 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32311 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32311 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32311 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "32311BR", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32311" ], "locale_variants": {} }, { "sku": "32312", "brand": "SKF", "manufacturer_designation": "SKF 32312", "series": "32300-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 130, "B_mm": 48.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2900, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 282, "static_load_kN": 290, "fatigue_load_limit_kN": 34, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32312 belongs to the SKF single-row tapered roller range — the 60 mm bore entry in the 32300 series, dimensioned 130 mm OD and 48.5 mm wide to the ISO 355 boundary plan.On the SKF nameplate, 32312 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the extra-heavy section, final digits 12 for the 60 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.03 (static 290 kN against dynamic 282 kN), typical of a tapered roller sized for axial capacity, and the 34 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one 32312 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 60 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 60 mm bore 32312 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 60 mm bore (130×48.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30212, so recalculate dn and lubricant film before substitution.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32312 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32312 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 130 mm cup race release as noise within the first running hours.", "The 282/290 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32312 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32312 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32312?", "a": "The SKF 32312 is a single-row tapered roller bearing with 60 mm bore, 130 mm outer diameter and 48.5 mm width (2.362 × 5.118 × 1.909 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 282 kN, C0 290 kN, fatigue load limit Pu 34 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 2900 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32312 bore code work?", "a": "The last two digits of 32312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 48.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32312 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32312 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32312 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32312 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32312" ], "locale_variants": {} }, { "sku": "32313", "brand": "SKF", "manufacturer_designation": "SKF 32313", "series": "32300-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 140, "B_mm": 51, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3500, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 323, "static_load_kN": 335, "fatigue_load_limit_kN": 40, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 65 mm shaft carrying combined load, SKF lists 32313 under catalogue execution SKF 32313: one open single-row tapered roller bearing in the extra-heavy section of the 32300 family.The code breaks down as type prefix 3 (tapered roller), series 2 (the extra-heavy section), and bore code 13 = 65 mm; dimensions 65×140×51 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 37.5 mm radial section height ((140−65)/2) and 3500 g catalogue mass frame a 65 mm bore bearing rated at 323 kN C — roughly 4.97 kN of dynamic capacity per millimetre of bore before application factors. For a 65 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32313 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 65 mm bore 32313 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 65 mm bore (140×51 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30213, so recalculate dn and lubricant film before substitution.", "Do not mix brands or executions inside one 32313 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Do not mix brands or executions inside one 32313 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 323/335 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32313 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32313 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32313?", "a": "The SKF 32313 is a single-row tapered roller bearing with 65 mm bore, 140 mm outer diameter and 51 mm width (2.559 × 5.512 × 2.008 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 323 kN, C0 335 kN, fatigue load limit Pu 40 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 3500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32313 bore code work?", "a": "The last two digits of 32313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 51 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32313 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32313 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32313 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32313 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32313" ], "locale_variants": {} }, { "sku": "32314", "brand": "SKF", "manufacturer_designation": "SKF 32314", "series": "32300-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 150, "B_mm": 54, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 4300, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 363, "static_load_kN": 380, "fatigue_load_limit_kN": 45, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32314 (SKF 32314) is the extra-heavy section tapered roller choice for a 70 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 150×54 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (extra-heavy section), and the last two digits encode the 70 mm bore; the 150 mm OD and 54 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 4300 g for the 70×150×54 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Mounting practice for 32314: the rotating cone takes the interference fit (k5 on a 70 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 70 mm bore 32314 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 70 mm bore (150×54 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30214, so recalculate dn and lubricant film before substitution.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32314 mounting error.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32314 mounting error.", "The 4300 g mass and 54 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32314.", "The 363/380 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32314 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32314 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32314?", "a": "The SKF 32314 is a single-row tapered roller bearing with 70 mm bore, 150 mm outer diameter and 54 mm width (2.756 × 5.906 × 2.126 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 363 kN, C0 380 kN, fatigue load limit Pu 45 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 4300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32314 bore code work?", "a": "The last two digits of 32314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 54 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32314 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32314 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32314 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32314 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32314" ], "locale_variants": {} }, { "sku": "32315", "brand": "SKF", "manufacturer_designation": "SKF 32315", "series": "32300-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 160, "B_mm": 58, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 5200, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 416, "static_load_kN": 440, "fatigue_load_limit_kN": 51, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 32315 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 75 mm shaft, extra-heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 32315 reads as bearing type 3 (single-row tapered roller), extra-heavy section series 2, and bore reference 15 resolving to 75 mm; 160 mm OD and 58 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 3,200 r/min reference speed the 42.5 mm-section 32315 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 4,300 r/min as the mechanical ceiling. Fit selection follows the rotating ring — interference on a rotating cone — and two 32315 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 75 mm bore 32315 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 75 mm bore (160×58 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30215, so recalculate dn and lubricant film before substitution.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32315 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32315 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Open 32315 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 416/440 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32315 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32315 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32315?", "a": "The SKF 32315 is a single-row tapered roller bearing with 75 mm bore, 160 mm outer diameter and 58 mm width (2.953 × 6.299 × 2.283 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 416 kN, C0 440 kN, fatigue load limit Pu 51 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 5200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32315 bore code work?", "a": "The last two digits of 32315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 58 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32315 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32315 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32315 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32315 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32315" ], "locale_variants": {} }, { "sku": "32316", "brand": "SKF", "manufacturer_designation": "SKF 32316", "series": "32300-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 170, "B_mm": 61.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 6200, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 404, "static_load_kN": 500, "fatigue_load_limit_kN": 56, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32316 is a single-row tapered roller bearing in the ISO 32300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Numbering ties the bearing to its envelope: 32316 means tapered-roller type 3, extra-heavy section series 2, 80 mm bore — which is why the 170×61.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 3,200 r/min thermal reference and 4,000 r/min mechanical limiting speed. A single 32316 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 80 mm bore 32316 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 80 mm bore (170×61.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30216, so recalculate dn and lubricant film before substitution.", "Setting is a design value, not an assembly feel: excessive preload in the 32316 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Setting is a design value, not an assembly feel: excessive preload in the 32316 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Shaft and housing fillets must clear the bearing chamfer so the 61.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 404/500 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32316 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32316 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32316?", "a": "The SKF 32316 is a single-row tapered roller bearing with 80 mm bore, 170 mm outer diameter and 61.5 mm width (3.15 × 6.693 × 2.421 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 404 kN, C0 500 kN, fatigue load limit Pu 56 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 6200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32316 bore code work?", "a": "The last two digits of 32316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 61.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32316 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32316 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32316 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32316 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32316" ], "locale_variants": {} }, { "sku": "32317", "brand": "SKF", "manufacturer_designation": "SKF 32317", "series": "32300-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 180, "B_mm": 63.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 7100, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 435, "static_load_kN": 530, "fatigue_load_limit_kN": 60, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The SKF 32317 is a 85×180×63.5 mm single-row tapered roller bearing — the extra-heavy section entry in the 32300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 32317 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the extra-heavy section, final digits 17 for the 85 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 435 kN and C0 530 kN, the 32317 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,800 r/min. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32317 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 85 mm bore 32317 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 85 mm bore (180×63.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30217, so recalculate dn and lubricant film before substitution.", "A single 32317 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "A single 32317 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Catalogue reference speed and limiting speed are different limits: the 3,000 r/min reference is a thermal criterion under load, while the 3,800 r/min limiting value is the mechanical ceiling — observe both.", "The 435/530 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32317 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32317 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32317?", "a": "The SKF 32317 is a single-row tapered roller bearing with 85 mm bore, 180 mm outer diameter and 63.5 mm width (3.346 × 7.087 × 2.5 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 435 kN, C0 530 kN, fatigue load limit Pu 60 kN, reference speed 3,000 r/min, limiting speed 3,800 r/min, mass about 7100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32317 bore code work?", "a": "The last two digits of 32317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 63.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32317 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32317 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32317 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32317 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32317" ], "locale_variants": {} }, { "sku": "32318", "brand": "SKF", "manufacturer_designation": "SKF 32318", "series": "32300-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 190, "B_mm": 67.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 8400, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 487, "static_load_kN": 610, "fatigue_load_limit_kN": 65.5, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 32318 appears as SKF 32318: an open, single-row tapered roller bearing in the extra-heavy section of the 32300 dimension series, supplied with a pressed-steel cage as standard.The code breaks down as type prefix 3 (tapered roller), series 2 (the extra-heavy section), and bore code 18 = 90 mm; dimensions 90×190×67.5 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 65.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.25 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32318 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 90 mm bore 32318 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 90 mm bore (190×67.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30218, so recalculate dn and lubricant film before substitution.", "At the 487 kN rating of 32318, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,600 r/min speed end and heavier preload only where moment stiffness dominates.", "At the 487 kN rating of 32318, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,600 r/min speed end and heavier preload only where moment stiffness dominates.", "The 32318 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 487/610 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32318 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32318 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32318?", "a": "The SKF 32318 is a single-row tapered roller bearing with 90 mm bore, 190 mm outer diameter and 67.5 mm width (3.543 × 7.48 × 2.657 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 487 kN, C0 610 kN, fatigue load limit Pu 65.5 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 8400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32318 bore code work?", "a": "The last two digits of 32318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 67.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32318 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32318 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32318 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32318 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32318" ], "locale_variants": {} }, { "sku": "32319", "brand": "SKF", "manufacturer_designation": "SKF 32319", "series": "32300-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 200, "B_mm": 71.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 9800, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 535, "static_load_kN": 670, "fatigue_load_limit_kN": 72, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32319 belongs to the SKF single-row tapered roller range — the 95 mm bore entry in the 32300 series, dimensioned 200 mm OD and 71.5 mm wide to the ISO 355 boundary plan.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (extra-heavy section), and the last two digits encode the 95 mm bore; the 200 mm OD and 71.5 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.25 (static 670 kN against dynamic 535 kN), typical of a tapered roller sized for axial capacity, and the 72 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one 32319 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 95 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 95 mm bore 32319 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 95 mm bore (200×71.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30219, so recalculate dn and lubricant film before substitution.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32319 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32319 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 200 mm cup race release as noise within the first running hours.", "The 535/670 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32319 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32319 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32319?", "a": "The SKF 32319 is a single-row tapered roller bearing with 95 mm bore, 200 mm outer diameter and 71.5 mm width (3.74 × 7.874 × 2.815 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 535 kN, C0 670 kN, fatigue load limit Pu 72 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 9800 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32319 bore code work?", "a": "The last two digits of 32319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 71.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32319 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32319 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32319 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32319 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32319" ], "locale_variants": {} }, { "sku": "32320", "brand": "SKF", "manufacturer_designation": "SKF 32320", "series": "32300-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 215, "B_mm": 77.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 12500, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 617, "static_load_kN": 780, "fatigue_load_limit_kN": 83, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 100 mm shaft carrying combined load, SKF lists 32320 under catalogue execution SKF 32320: one open single-row tapered roller bearing in the extra-heavy section of the 32300 family.On the SKF nameplate, 32320 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the extra-heavy section, final digits 20 for the 100 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 12500 g for the 100×215×77.5 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. A single 32320 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 100 mm bore 32320 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 100 mm bore (215×77.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30220, so recalculate dn and lubricant film before substitution.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32320 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "At the 617 kN rating of 32320, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,200 r/min speed end and heavier preload only where moment stiffness dominates.", "Open 32320 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 617/780 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32320 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32320 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32320?", "a": "The SKF 32320 is a single-row tapered roller bearing with 100 mm bore, 215 mm outer diameter and 77.5 mm width (3.937 × 8.465 × 3.051 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 617 kN, C0 780 kN, fatigue load limit Pu 83 kN, reference speed 2,200 r/min, limiting speed 3,200 r/min, mass about 12500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32320 bore code work?", "a": "The last two digits of 32320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 77.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32320 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32320 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32320 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32320 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32320" ], "locale_variants": {} }, { "sku": "32321", "brand": "SKF", "manufacturer_designation": "SKF 32321", "series": "32300-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 225, "B_mm": 81.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 14000, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 645, "static_load_kN": 815, "fatigue_load_limit_kN": 85, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "SKF 32321 (SKF 32321) is the extra-heavy section tapered roller choice for a 105 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 225×81.5 mm ISO 355 envelope.The code breaks down as type prefix 3 (tapered roller), series 2 (the extra-heavy section), and bore code 21 = 105 mm; dimensions 105×225×81.5 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 2,000 r/min reference speed the 60.0 mm-section 32321 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 3,000 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32321 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 105 mm bore 32321 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 105 mm bore (225×81.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30221, so recalculate dn and lubricant film before substitution.", "Do not mix brands or executions inside one 32321 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32321 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 81.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 645/815 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32321 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32321 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32321?", "a": "The SKF 32321 is a single-row tapered roller bearing with 105 mm bore, 225 mm outer diameter and 81.5 mm width (4.134 × 8.858 × 3.209 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 645 kN, C0 815 kN, fatigue load limit Pu 85 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 14000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32321 bore code work?", "a": "The last two digits of 32321 are bore code 21, so 21 × 5 = 105 mm bore. The 225 mm OD and 81.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32321 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32321 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32321 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32321 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32321", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32321" ], "locale_variants": {} }, { "sku": "32322", "brand": "SKF", "manufacturer_designation": "SKF 32322", "series": "32300-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 240, "B_mm": 84.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 16500, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 675, "static_load_kN": 830, "fatigue_load_limit_kN": 86.5, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number SKF 32322 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 110 mm shaft, extra-heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (extra-heavy section), and the last two digits encode the 110 mm bore; the 240 mm OD and 84.5 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 1,900 r/min thermal reference and 2,800 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32322 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 110 mm bore 32322 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 323 series at 110 mm bore (240×84.5 mm) is the heavy-duty section of the tapered family; it runs hotter at the same speed than a 30222, so recalculate dn and lubricant film before substitution.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32322 mounting error.", "Do not mix brands or executions inside one 32322 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.", "The 675/830 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 32322 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 32322 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32322?", "a": "The SKF 32322 is a single-row tapered roller bearing with 110 mm bore, 240 mm outer diameter and 84.5 mm width (4.331 × 9.449 × 3.327 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 675 kN, C0 830 kN, fatigue load limit Pu 86.5 kN, reference speed 1,900 r/min, limiting speed 2,800 r/min, mass about 16500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32322 bore code work?", "a": "The last two digits of 32322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 84.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32322 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (extra-heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32322 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32322 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32322 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32322" ], "locale_variants": {} }, { "sku": "NU204", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28.5, "static_load_kN": 22, "fatigue_load_limit_kN": 2.75, "max_rpm": 19000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 19000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 204 ECP", "naming_rule_text": "SKF NU204 (NU 204 ECP) is the standard cylindrical roller choice for a 20 mm shaft — one row of precisely profiled rollers on ground raceways inside the 47×14 mm ISO 15 envelope. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 04 = 20 mm; dimensions 20×47×14 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 28.5 kN and C0 22 kN, the NU204 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "machine-tool spindle support (radial set)", "agricultural machinery power-take-off shafts", "automotive alternator and starter shafts", "small conveyor drum bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At a 20 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU204 develops edge loading and early spalling.", "The NU200 series at 20 mm bore (47×14 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The NU204 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 47 mm race release as noise within the first running hours.", "The 28.5/22 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU204 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 204 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU204?", "a": "The NU 204 ECP is a single-row cylindrical roller bearing with 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 28.5 kN, C0 22 kN, fatigue load limit Pu 2.75 kN, reference speed 17,000 r/min, limiting speed 19,000 r/min, mass about 110 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU204 bore code work?", "a": "The last two digits of NU204 are bore code 04, so 04 × 5 = 20 mm bore. The 47 mm OD and 14 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU204?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU204 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU204 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 204 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 204 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 204 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU204 ECP", "NU204 ECP" ] }, { "sku": "NU205", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 32.5, "static_load_kN": 27, "fatigue_load_limit_kN": 3.35, "max_rpm": 16000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 16000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 205 ECP", "naming_rule_text": "Ordering number NU 205 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 25 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 25 mm bore; the 52 mm OD and 15 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 3.35 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.83 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. The outer ring has no ribs and cannot locate the shaft axially; pair NU205 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "automotive alternator and starter shafts", "small conveyor drum bearings", "small electric-motor armature shafts", "light-duty gearbox intermediate shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU205 develops edge loading and early spalling.", "The NU200 series at 25 mm bore (52×15 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 16,000 r/min limiting value is the mechanical ceiling — observe both.", "The 32.5/27 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU205 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 205 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU205?", "a": "The NU 205 ECP is a single-row cylindrical roller bearing with 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 32.5 kN, C0 27 kN, fatigue load limit Pu 3.35 kN, reference speed 15,000 r/min, limiting speed 16,000 r/min, mass about 130 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU205 bore code work?", "a": "The last two digits of NU205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU205?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU205 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU205 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 205 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 205 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 205 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU205 ECP", "NU205 ECP" ] }, { "sku": "NU206", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.5, "max_rpm": 14000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 14000, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 206 ECP", "naming_rule_text": "NU206 is a single-row cylindrical roller bearing in the NU200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, NU206 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 06 resolving to 30 mm; 62 mm OD and 16 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.83 (static 36.5 kN against dynamic 44 kN), typical of a cylindrical roller sized for high radial capacity, and the 4.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 30 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 30 mm bore (62×16 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 200 g mass and 16 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU206.", "Open NU206 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 44/36.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU206 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 206 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU206?", "a": "The NU 206 ECP is a single-row cylindrical roller bearing with 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 44 kN, C0 36.5 kN, fatigue load limit Pu 4.5 kN, reference speed 13,000 r/min, limiting speed 14,000 r/min, mass about 200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU206 bore code work?", "a": "The last two digits of NU206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 16 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU206?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU206 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU206 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 206 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 206 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 206 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU206 ECP", "NU206 ECP" ] }, { "sku": "NU207", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 56, "static_load_kN": 48, "fatigue_load_limit_kN": 6.1, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 207 ECP", "naming_rule_text": "The NU 207 ECP is a 35×72×17 mm single-row cylindrical roller bearing — the standard entry in the NU200 series, with separable inner ring and roller assembly for easy mounting. Numbering ties the bearing to its envelope: NU207 means cylindrical-roller type NU, standard series 2, 35 mm bore — which is why the 72×17 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 18.5 mm radial section height ((72−35)/2) and 290 g catalogue mass frame a 35 mm bore bearing rated at 56 kN C — roughly 1.60 kN of dynamic capacity per millimetre of bore before application factors. For a 35 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 35 mm bore (72×17 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 72 mm race release as noise within the first running hours.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The 56/48 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU207 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 207 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU207?", "a": "The NU 207 ECP is a single-row cylindrical roller bearing with 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 56 kN, C0 48 kN, fatigue load limit Pu 6.1 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 290 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU207 bore code work?", "a": "The last two digits of NU207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 17 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU207?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU207 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU207 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 207 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 207 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 207 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU207 ECP", "NU207 ECP" ] }, { "sku": "NU208", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 62, "static_load_kN": 53, "fatigue_load_limit_kN": 6.7, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 208 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU208 appears as NU 208 ECP: an open, single-row cylindrical roller bearing in the NU200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU208 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 08 for the 40 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 370 g for the 40×80×18 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 40 mm bore (80×18 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.", "The NU208 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 62/53 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU208 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 208 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU208?", "a": "The NU 208 ECP is a single-row cylindrical roller bearing with 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 62 kN, C0 53 kN, fatigue load limit Pu 6.7 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 370 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU208 bore code work?", "a": "The last two digits of NU208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 18 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU208?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU208 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU208 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 208 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 208 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 208 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU208 ECP", "NU208 ECP" ] }, { "sku": "NU209", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 64, "fatigue_load_limit_kN": 8.15, "max_rpm": 9500, "reference_speed_rpm": 9000, "limiting_speed_rpm": 9500, "weight_g": 420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 209 ECP", "naming_rule_text": "NU 209 ECP belongs to the SKF single-row cylindrical roller range — the 45 mm bore entry in the NU200 series, dimensioned 85 mm OD and 19 mm wide to the ISO 15 boundary plan. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 09 = 45 mm; dimensions 45×85×19 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 9,000 r/min reference speed the 20.0 mm-section NU209 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 9,500 r/min as the mechanical ceiling. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.", "applications": [ "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 45 mm bore (85×19 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Open NU209 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 69.5/64 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU209 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 209 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU209?", "a": "The NU 209 ECP is a single-row cylindrical roller bearing with 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.5 kN, C0 64 kN, fatigue load limit Pu 8.15 kN, reference speed 9,000 r/min, limiting speed 9,500 r/min, mass about 420 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU209 bore code work?", "a": "The last two digits of NU209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 19 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU209?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU209 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU209 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 209 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 209 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 209 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU209 ECP", "NU209 ECP" ] }, { "sku": "NU210", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 73.5, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.8, "max_rpm": 9000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 9000, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 210 ECP", "naming_rule_text": "For a 50 mm shaft carrying pure radial load, SKF lists NU210 under catalogue execution NU 210 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU210 means cylindrical-roller type NU, standard series 2, 50 mm bore — which is why the 90×20 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 73.5 kN and C0 69.5 kN, the NU210 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 50 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 50 mm bore (90×20 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Open NU210 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The NU210 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 73.5/69.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU210 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 210 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU210?", "a": "The NU 210 ECP is a single-row cylindrical roller bearing with 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 73.5 kN, C0 69.5 kN, fatigue load limit Pu 8.8 kN, reference speed 8,500 r/min, limiting speed 9,000 r/min, mass about 470 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU210 bore code work?", "a": "The last two digits of NU210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 20 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU210?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU210 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU210 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 210 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 210 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 210 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU210 ECP", "NU210 ECP" ] }, { "sku": "NU211", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 96.5, "static_load_kN": 95, "fatigue_load_limit_kN": 12.2, "max_rpm": 8000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "weight_g": 660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 211 ECP", "naming_rule_text": "SKF NU211 (NU 211 ECP) is the standard cylindrical roller choice for a 55 mm shaft — one row of precisely profiled rollers on ground raceways inside the 100×21 mm ISO 15 envelope. On the SKF nameplate, NU211 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 11 for the 55 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 12.2 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.98 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. For a 55 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU200 series at 55 mm bore (100×21 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 96.5/95 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU211 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 211 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU211?", "a": "The NU 211 ECP is a single-row cylindrical roller bearing with 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 96.5 kN, C0 95 kN, fatigue load limit Pu 12.2 kN, reference speed 7,500 r/min, limiting speed 8,000 r/min, mass about 660 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU211 bore code work?", "a": "The last two digits of NU211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 21 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU211?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU211 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU211 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 211 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 211 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 211 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU211 ECP", "NU211 ECP" ] }, { "sku": "NU212", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 108, "static_load_kN": 102, "fatigue_load_limit_kN": 13.4, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 212 ECP", "naming_rule_text": "Ordering number NU 212 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 60 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 12 = 60 mm; dimensions 60×110×22 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.94 (static 102 kN against dynamic 108 kN), typical of a cylindrical roller sized for high radial capacity, and the 13.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Mount the 60 mm bore NU212 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 60 mm bore (110×22 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The NU212 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 800 g mass and 22 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU212.", "The 108/102 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU212 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 212 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU212?", "a": "The NU 212 ECP is a single-row cylindrical roller bearing with 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 108 kN, C0 102 kN, fatigue load limit Pu 13.4 kN, reference speed 6,700 r/min, limiting speed 7,500 r/min, mass about 800 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU212 bore code work?", "a": "The last two digits of NU212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 22 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU212?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU212 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU212 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 212 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 212 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 212 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU212 ECP", "NU212 ECP" ] }, { "sku": "NU213", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 122, "static_load_kN": 118, "fatigue_load_limit_kN": 15.6, "max_rpm": 6700, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6700, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 213 ECP", "naming_rule_text": "NU213 is a single-row cylindrical roller bearing in the NU200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 65 mm bore; the 120 mm OD and 23 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 27.5 mm radial section height ((120−65)/2) and 1000 g catalogue mass frame a 65 mm bore bearing rated at 122 kN C — roughly 1.88 kN of dynamic capacity per millimetre of bore before application factors. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.", "applications": [ "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 65 mm bore NU213 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 65 mm bore (120×23 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 120 mm race release as noise within the first running hours.", "The 122/118 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU213 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 213 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU213?", "a": "The NU 213 ECP is a single-row cylindrical roller bearing with 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 122 kN, C0 118 kN, fatigue load limit Pu 15.6 kN, reference speed 6,300 r/min, limiting speed 6,700 r/min, mass about 1000 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU213 bore code work?", "a": "The last two digits of NU213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU213?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU213 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU213 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU213-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 213 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 213 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 213 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU213 ECP", "NU213 ECP" ] }, { "sku": "NU214", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 137, "static_load_kN": 137, "fatigue_load_limit_kN": 18, "max_rpm": 6300, "reference_speed_rpm": 6000, "limiting_speed_rpm": 6300, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 214 ECP", "naming_rule_text": "The NU 214 ECP is a 70×125×24 mm single-row cylindrical roller bearing — the standard entry in the NU200 series, with separable inner ring and roller assembly for easy mounting. Digit by digit, NU214 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 14 resolving to 70 mm; 125 mm OD and 24 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 1150 g for the 70×125×24 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.", "applications": [ "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 70 mm bore NU214 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 70 mm bore (125×24 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 1150 g mass and 24 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU214.", "Catalogue reference speed and limiting speed are different limits: the 6,000 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 137/137 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU214 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 214 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU214?", "a": "The NU 214 ECP is a single-row cylindrical roller bearing with 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 137 kN, C0 137 kN, fatigue load limit Pu 18 kN, reference speed 6,000 r/min, limiting speed 6,300 r/min, mass about 1150 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU214 bore code work?", "a": "The last two digits of NU214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 24 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU214?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU214 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU214 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU214-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 214 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 214 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 214 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU214 ECP", "NU214 ECP" ] }, { "sku": "NU215", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 150, "static_load_kN": 156, "fatigue_load_limit_kN": 20.4, "max_rpm": 6000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6000, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 215 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU215 appears as NU 215 ECP: an open, single-row cylindrical roller bearing in the NU200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Numbering ties the bearing to its envelope: NU215 means cylindrical-roller type NU, standard series 2, 75 mm bore — which is why the 130×25 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 5,600 r/min reference speed the 27.5 mm-section NU215 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 6,000 r/min as the mechanical ceiling. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 75 mm bore NU215 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 75 mm bore (130×25 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 130 mm race release as noise within the first running hours.", "Open NU215 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 150/156 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU215 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 215 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU215?", "a": "The NU 215 ECP is a single-row cylindrical roller bearing with 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 150 kN, C0 156 kN, fatigue load limit Pu 20.4 kN, reference speed 5,600 r/min, limiting speed 6,000 r/min, mass about 1250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU215 bore code work?", "a": "The last two digits of NU215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU215?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU215 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU215 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU215-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 215 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 215 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 215 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU215 ECP", "NU215 ECP" ] }, { "sku": "NU216", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 160, "static_load_kN": 166, "fatigue_load_limit_kN": 21.2, "max_rpm": 5600, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5600, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 216 ECP", "naming_rule_text": "NU 216 ECP belongs to the SKF single-row cylindrical roller range — the 80 mm bore entry in the NU200 series, dimensioned 140 mm OD and 26 mm wide to the ISO 15 boundary plan. On the SKF nameplate, NU216 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 16 for the 80 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 5,300 r/min thermal reference and 5,600 r/min mechanical limiting speed. The outer ring has no ribs and cannot locate the shaft axially; pair NU216 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "large pump and turbine shafts", "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Mount the 80 mm bore NU216 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 80 mm bore (140×26 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The 160/166 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU216 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 216 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU216?", "a": "The NU 216 ECP is a single-row cylindrical roller bearing with 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 160 kN, C0 166 kN, fatigue load limit Pu 21.2 kN, reference speed 5,300 r/min, limiting speed 5,600 r/min, mass about 1550 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU216 bore code work?", "a": "The last two digits of NU216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 26 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU216?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU216 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU216 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU216-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 216 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 216 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 216 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU216 ECP", "NU216 ECP" ] }, { "sku": "NU217", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 25, "max_rpm": 5300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5300, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 217 ECP", "naming_rule_text": "For a 85 mm shaft carrying pure radial load, SKF lists NU217 under catalogue execution NU 217 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 17 = 85 mm; dimensions 85×150×28 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 190 kN and C0 200 kN, the NU217 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 85 mm shaft typically takes a k5 seat with an H6 housing bore.", "applications": [ "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 85 mm bore NU217 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 85 mm bore (150×28 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Open NU217 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The NU217 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 190/200 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU217 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 217 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU217?", "a": "The NU 217 ECP is a single-row cylindrical roller bearing with 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 190 kN, C0 200 kN, fatigue load limit Pu 25 kN, reference speed 4,800 r/min, limiting speed 5,300 r/min, mass about 1900 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU217 bore code work?", "a": "The last two digits of NU217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 28 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU217?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU217 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU217 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU217-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 217 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 217 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 217 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU217 ECP", "NU217 ECP" ] }, { "sku": "NU218", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 208, "static_load_kN": 220, "fatigue_load_limit_kN": 27, "max_rpm": 5000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 218 ECP", "naming_rule_text": "SKF NU218 (NU 218 ECP) is the standard cylindrical roller choice for a 90 mm shaft — one row of precisely profiled rollers on ground raceways inside the 160×30 mm ISO 15 envelope. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 90 mm bore; the 160 mm OD and 30 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 27 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.06 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. For a 90 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 90 mm bore NU218 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 90 mm bore (160×30 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 208/220 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU218 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 218 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU218?", "a": "The NU 218 ECP is a single-row cylindrical roller bearing with 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 208 kN, C0 220 kN, fatigue load limit Pu 27 kN, reference speed 4,500 r/min, limiting speed 5,000 r/min, mass about 2300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU218 bore code work?", "a": "The last two digits of NU218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 30 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU218?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU218 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU218 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU218-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 218 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 218 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 218 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU218 ECP", "NU218 ECP" ] }, { "sku": "NU219", "brand": "SKF", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 255, "static_load_kN": 265, "fatigue_load_limit_kN": 32.5, "max_rpm": 4800, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4800, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 219 ECP", "naming_rule_text": "Ordering number NU 219 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 95 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Digit by digit, NU219 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 19 resolving to 95 mm; 170 mm OD and 32 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 1.04 (static 265 kN against dynamic 255 kN), typical of a cylindrical roller sized for high radial capacity, and the 32.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 95 mm bore NU219 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU200 series at 95 mm bore (170×32 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The NU219 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 2850 g mass and 32 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU219.", "The 255/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU219 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 219 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU219?", "a": "The NU 219 ECP is a single-row cylindrical roller bearing with 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 255 kN, C0 265 kN, fatigue load limit Pu 32.5 kN, reference speed 4,300 r/min, limiting speed 4,800 r/min, mass about 2850 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU219 bore code work?", "a": "The last two digits of NU219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 32 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU219?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU219 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU219 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU219-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 219 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 219 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 219 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU219 ECP", "NU219 ECP" ] }, { "sku": "NU220", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 285, "static_load_kN": 305, "fatigue_load_limit_kN": 36.5, "max_rpm": 4500, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4500, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 220 ECP", "naming_rule_text": "NU220 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 20 = 100 mm; dimensions 100×180×34 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 3350 g for the 100×180×34 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. The outer ring has no ribs and cannot locate the shaft axially; pair NU220 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 100 mm bore NU220 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU2200 series at 100 mm bore (180×34 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The NU220 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 285/305 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU220 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 220 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU220?", "a": "The NU 220 ECP is a single-row cylindrical roller bearing with 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 285 kN, C0 305 kN, fatigue load limit Pu 36.5 kN, reference speed 4,000 r/min, limiting speed 4,500 r/min, mass about 3350 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU220 bore code work?", "a": "The last two digits of NU220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 34 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU220?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU220 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU220 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU220-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 220 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 220 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 220 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU220 ECP", "NU220 ECP" ] }, { "sku": "NU304", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35.5, "static_load_kN": 26, "fatigue_load_limit_kN": 3.25, "max_rpm": 18000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 18000, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 304 ECP", "naming_rule_text": "NU304 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, NU304 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 04 for the 20 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 16.0 mm radial section height ((52−20)/2) and 140 g catalogue mass frame a 20 mm bore bearing rated at 35.5 kN C — roughly 1.77 kN of dynamic capacity per millimetre of bore before application factors. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "pump and compressor crankshafts", "machine-tool spindle support (radial set)", "agricultural machinery power-take-off shafts", "automotive alternator and starter shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At a 20 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU304 develops edge loading and early spalling.", "The NU300 series at 20 mm bore (52×15 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 18,000 r/min limiting value is the mechanical ceiling — observe both.", "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 18,000 r/min limiting value is the mechanical ceiling — observe both.", "The 35.5/26 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU304 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 304 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU304?", "a": "The NU 304 ECP is a single-row cylindrical roller bearing with 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 35.5 kN, C0 26 kN, fatigue load limit Pu 3.25 kN, reference speed 15,000 r/min, limiting speed 18,000 r/min, mass about 140 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU304 bore code work?", "a": "The last two digits of NU304 are bore code 04, so 04 × 5 = 20 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU304?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU304 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU304 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 304 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 304 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 304 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU304 ECP", "NU304 ECP" ] }, { "sku": "NU305", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.55, "max_rpm": 15000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 305 ECP", "naming_rule_text": "The NU 305 ECP is a 25×62×17 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 05 = 25 mm; dimensions 25×62×17 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 230 g for the 25×62×17 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. The outer ring has no ribs and cannot locate the shaft axially; pair NU305 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "agricultural machinery power-take-off shafts", "automotive alternator and starter shafts", "small conveyor drum bearings", "small electric-motor armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU305 develops edge loading and early spalling.", "The NU300 series at 25 mm bore (62×17 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Open NU305 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "Open NU305 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 46.5/36.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU305 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 305 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU305?", "a": "The NU 305 ECP is a single-row cylindrical roller bearing with 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 46.5 kN, C0 36.5 kN, fatigue load limit Pu 4.55 kN, reference speed 12,000 r/min, limiting speed 15,000 r/min, mass about 230 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU305 bore code work?", "a": "The last two digits of NU305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 17 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU305?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU305 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU305 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 305 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 305 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 305 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU305 ECP", "NU305 ECP" ] }, { "sku": "NU306", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 58.5, "static_load_kN": 48, "fatigue_load_limit_kN": 6.2, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 306 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU306 appears as NU 306 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 30 mm bore; the 72 mm OD and 19 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 11,000 r/min reference speed the 21.0 mm-section NU306 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 12,000 r/min as the mechanical ceiling. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 30 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 30 mm bore (72×19 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The 58.5/48 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU306 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 306 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU306?", "a": "The NU 306 ECP is a single-row cylindrical roller bearing with 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 58.5 kN, C0 48 kN, fatigue load limit Pu 6.2 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 360 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU306 bore code work?", "a": "The last two digits of NU306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 19 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU306?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU306 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU306 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 306 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 306 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 306 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU306 ECP", "NU306 ECP" ] }, { "sku": "NU307", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 75, "static_load_kN": 63, "fatigue_load_limit_kN": 8.15, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 307 ECP", "naming_rule_text": "NU 307 ECP belongs to the SKF single-row cylindrical roller range — the 35 mm bore entry in the NU300 series, dimensioned 80 mm OD and 21 mm wide to the ISO 15 boundary plan. Digit by digit, NU307 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 07 resolving to 35 mm; 80 mm OD and 21 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 9,500 r/min thermal reference and 11,000 r/min mechanical limiting speed. For a 35 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 35 mm bore (80×21 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The NU307 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The NU307 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 75/63 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU307 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 307 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU307?", "a": "The NU 307 ECP is a single-row cylindrical roller bearing with 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 75 kN, C0 63 kN, fatigue load limit Pu 8.15 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 470 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU307 bore code work?", "a": "The last two digits of NU307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 21 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU307?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU307 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU307 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 307 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 307 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 307 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU307 ECP", "NU307 ECP" ] }, { "sku": "NU308", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 78, "fatigue_load_limit_kN": 10.2, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 308 ECP", "naming_rule_text": "For a 40 mm shaft carrying pure radial load, SKF lists NU308 under catalogue execution NU 308 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU308 means cylindrical-roller type NU, standard series 3, 40 mm bore — which is why the 90×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 93 kN and C0 78 kN, the NU308 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 40 mm bore (90×23 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 93/78 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU308 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 308 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU308?", "a": "The NU 308 ECP is a single-row cylindrical roller bearing with 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93 kN, C0 78 kN, fatigue load limit Pu 10.2 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 650 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU308 bore code work?", "a": "The last two digits of NU308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU308?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU308 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU308 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 308 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 308 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 308 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU308 ECP", "NU308 ECP" ] }, { "sku": "NU309", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 12.9, "max_rpm": 8500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8500, "weight_g": 900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 309 ECP", "naming_rule_text": "SKF NU309 (NU 309 ECP) is the standard cylindrical roller choice for a 45 mm shaft — one row of precisely profiled rollers on ground raceways inside the 100×25 mm ISO 15 envelope. On the SKF nameplate, NU309 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 09 for the 45 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 12.9 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.89 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.", "applications": [ "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 45 mm bore (100×25 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 900 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU309.", "The 900 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU309.", "The 112/100 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU309 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 309 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU309?", "a": "The NU 309 ECP is a single-row cylindrical roller bearing with 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 112 kN, C0 100 kN, fatigue load limit Pu 12.9 kN, reference speed 7,500 r/min, limiting speed 8,500 r/min, mass about 900 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU309 bore code work?", "a": "The last two digits of NU309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU309?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU309 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU309 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 309 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 309 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 309 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU309 ECP", "NU309 ECP" ] }, { "sku": "NU310", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 127, "static_load_kN": 112, "fatigue_load_limit_kN": 15, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 310 ECP", "naming_rule_text": "Ordering number NU 310 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 50 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Digit by digit, NU310 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 10 resolving to 50 mm; 110 mm OD and 27 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 30.0 mm radial section height ((110−50)/2) and 1100 g catalogue mass frame a 50 mm bore bearing rated at 127 kN C — roughly 2.54 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 50 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 50 mm bore (110×27 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 1100 g mass and 27 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU310.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 127/112 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU310 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 310 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU310?", "a": "The NU 310 ECP is a single-row cylindrical roller bearing with 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 127 kN, C0 112 kN, fatigue load limit Pu 15 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 1100 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU310 bore code work?", "a": "The last two digits of NU310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 27 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU310?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU310 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU310 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 310 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 310 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 310 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU310 ECP", "NU310 ECP" ] }, { "sku": "NU311", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 156, "static_load_kN": 143, "fatigue_load_limit_kN": 18.6, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 311 ECP", "naming_rule_text": "NU311 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: NU311 means cylindrical-roller type NU, standard series 3, 55 mm bore — which is why the 120×29 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 1450 g for the 55×120×29 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 55 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU300 series at 55 mm bore (120×29 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 120 mm race release as noise within the first running hours.", "The 1450 g mass and 29 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU311.", "The 156/143 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU311 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 311 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU311?", "a": "The NU 311 ECP is a single-row cylindrical roller bearing with 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 156 kN, C0 143 kN, fatigue load limit Pu 18.6 kN, reference speed 6,000 r/min, limiting speed 7,000 r/min, mass about 1450 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU311 bore code work?", "a": "The last two digits of NU311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 29 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU311?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU311 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU311 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 311 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 311 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 311 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU311 ECP", "NU311 ECP" ] }, { "sku": "NU312", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 173, "static_load_kN": 160, "fatigue_load_limit_kN": 21.2, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 312 ECP", "naming_rule_text": "The NU 312 ECP is a 60×130×31 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. On the SKF nameplate, NU312 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 12 for the 60 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 5,600 r/min reference speed the 35.0 mm-section NU312 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 6,700 r/min as the mechanical ceiling. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 60 mm bore NU312 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 60 mm bore (130×31 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 5,600 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 130 mm race release as noise within the first running hours.", "The 173/160 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU312 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 312 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU312?", "a": "The NU 312 ECP is a single-row cylindrical roller bearing with 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 173 kN, C0 160 kN, fatigue load limit Pu 21.2 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 1750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU312 bore code work?", "a": "The last two digits of NU312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU312?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU312 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU312 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 312 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 312 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 312 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU312 ECP", "NU312 ECP" ] }, { "sku": "NU313", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 212, "static_load_kN": 196, "fatigue_load_limit_kN": 25.5, "max_rpm": 6000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6000, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 313 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU313 appears as NU 313 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 13 = 65 mm; dimensions 65×140×33 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 5,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.", "applications": [ "large pump and turbine shafts", "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 65 mm bore NU313 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 65 mm bore (140×33 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Open NU313 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 6,000 r/min limiting value is the mechanical ceiling — observe both.", "The 212/196 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU313 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 313 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU313?", "a": "The NU 313 ECP is a single-row cylindrical roller bearing with 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 212 kN, C0 196 kN, fatigue load limit Pu 25.5 kN, reference speed 5,300 r/min, limiting speed 6,000 r/min, mass about 2200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU313 bore code work?", "a": "The last two digits of NU313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU313?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU313 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU313 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 313 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 313 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 313 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU313 ECP", "NU313 ECP" ] }, { "sku": "NU314", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 236, "static_load_kN": 228, "fatigue_load_limit_kN": 29, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 314 ECP", "naming_rule_text": "NU 314 ECP belongs to the SKF single-row cylindrical roller range — the 70 mm bore entry in the NU300 series, dimensioned 150 mm OD and 35 mm wide to the ISO 15 boundary plan. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 70 mm bore; the 150 mm OD and 35 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 236 kN and C0 228 kN, the NU314 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.", "applications": [ "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 70 mm bore NU314 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 70 mm bore (150×35 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Open NU314 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 236/228 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU314 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 314 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU314?", "a": "The NU 314 ECP is a single-row cylindrical roller bearing with 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 236 kN, C0 228 kN, fatigue load limit Pu 29 kN, reference speed 4,800 r/min, limiting speed 5,600 r/min, mass about 2700 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU314 bore code work?", "a": "The last two digits of NU314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 35 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU314?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU314 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU314 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 314 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 314 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 314 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU314 ECP", "NU314 ECP" ] }, { "sku": "NU315", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 280, "static_load_kN": 265, "fatigue_load_limit_kN": 33.5, "max_rpm": 5300, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5300, "weight_g": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 315 ECP", "naming_rule_text": "For a 75 mm shaft carrying pure radial load, SKF lists NU315 under catalogue execution NU 315 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Digit by digit, NU315 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 15 resolving to 75 mm; 160 mm OD and 37 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 33.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.95 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Mount the 75 mm bore NU315 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 75 mm bore (160×37 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The NU315 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The 280/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU315 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 315 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU315?", "a": "The NU 315 ECP is a single-row cylindrical roller bearing with 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 280 kN, C0 265 kN, fatigue load limit Pu 33.5 kN, reference speed 4,500 r/min, limiting speed 5,300 r/min, mass about 3300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU315 bore code work?", "a": "The last two digits of NU315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 37 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU315?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU315 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU315 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 315 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 315 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 315 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU315 ECP", "NU315 ECP" ] }, { "sku": "NU316", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 300, "static_load_kN": 290, "fatigue_load_limit_kN": 36, "max_rpm": 5000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5000, "weight_g": 3850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 316 ECP", "naming_rule_text": "SKF NU316 (NU 316 ECP) is the standard cylindrical roller choice for a 80 mm shaft — one row of precisely profiled rollers on ground raceways inside the 170×39 mm ISO 15 envelope. Numbering ties the bearing to its envelope: NU316 means cylindrical-roller type NU, standard series 3, 80 mm bore — which is why the 170×39 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.97 (static 290 kN against dynamic 300 kN), typical of a cylindrical roller sized for high radial capacity, and the 36 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The outer ring has no ribs and cannot locate the shaft axially; pair NU316 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 80 mm bore NU316 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 80 mm bore (170×39 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The NU316 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 300/290 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU316 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 316 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU316?", "a": "The NU 316 ECP is a single-row cylindrical roller bearing with 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 300 kN, C0 290 kN, fatigue load limit Pu 36 kN, reference speed 4,300 r/min, limiting speed 5,000 r/min, mass about 3850 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU316 bore code work?", "a": "The last two digits of NU316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 39 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU316?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU316 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU316 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 316 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 316 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 316 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU316 ECP", "NU316 ECP" ] }, { "sku": "NU317", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 340, "static_load_kN": 335, "fatigue_load_limit_kN": 41.5, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 4650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 317 ECP", "naming_rule_text": "Ordering number NU 317 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 85 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. On the SKF nameplate, NU317 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 17 for the 85 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 47.5 mm radial section height ((180−85)/2) and 4650 g catalogue mass frame a 85 mm bore bearing rated at 340 kN C — roughly 4.00 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 85 mm shaft typically takes a k5 seat with an H6 housing bore.", "applications": [ "rolling-mill work-roll backup bearings", "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 85 mm bore NU317 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 85 mm bore (180×41 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "The 4650 g mass and 41 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU317.", "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 340/335 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU317 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 317 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU317?", "a": "The NU 317 ECP is a single-row cylindrical roller bearing with 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 340 kN, C0 335 kN, fatigue load limit Pu 41.5 kN, reference speed 4,000 r/min, limiting speed 4,800 r/min, mass about 4650 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU317 bore code work?", "a": "The last two digits of NU317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 41 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU317?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU317 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU317 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU317-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 317 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 317 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 317 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU317 ECP", "NU317 ECP" ] }, { "sku": "NU318", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 365, "static_load_kN": 360, "fatigue_load_limit_kN": 43, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 5250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 318 ECP", "naming_rule_text": "NU318 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 18 = 90 mm; dimensions 90×190×43 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 5250 g for the 90×190×43 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 90 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 90 mm bore NU318 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 90 mm bore (190×43 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 190 mm race release as noise within the first running hours.", "The 5250 g mass and 43 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU318.", "The 365/360 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU318 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 318 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU318?", "a": "The NU 318 ECP is a single-row cylindrical roller bearing with 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 365 kN, C0 360 kN, fatigue load limit Pu 43 kN, reference speed 3,800 r/min, limiting speed 4,500 r/min, mass about 5250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU318 bore code work?", "a": "The last two digits of NU318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 43 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU318?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU318 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU318 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 318 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 318 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP318-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 318 ECJ is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU318 ECP", "NU318 ECP" ] }, { "sku": "NU319", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 390, "static_load_kN": 390, "fatigue_load_limit_kN": 46.5, "max_rpm": 4300, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4300, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 319 ECP", "naming_rule_text": "The NU 319 ECP is a 95×200×45 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 95 mm bore; the 200 mm OD and 45 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 3,600 r/min reference speed the 52.5 mm-section NU319 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 4,300 r/min as the mechanical ceiling. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.", "applications": [ "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts", "rolling-mill work-roll backup bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Mount the 95 mm bore NU319 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 95 mm bore (200×45 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 3,600 r/min reference is a thermal criterion under load, while the 4,300 r/min limiting value is the mechanical ceiling — observe both.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 200 mm race release as noise within the first running hours.", "The 390/390 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU319 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 319 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU319?", "a": "The NU 319 ECP is a single-row cylindrical roller bearing with 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 390 kN, C0 390 kN, fatigue load limit Pu 46.5 kN, reference speed 3,600 r/min, limiting speed 4,300 r/min, mass about 6200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU319 bore code work?", "a": "The last two digits of NU319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 45 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU319?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU319 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU319 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 319 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 319 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 319 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU319 ECP", "NU319 ECP" ] }, { "sku": "NU320", "brand": "SKF", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 450, "static_load_kN": 440, "fatigue_load_limit_kN": 51, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 7450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 320 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU320 appears as NU 320 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU320 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 20 for the 100 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 450 kN and C0 440 kN, the NU320 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. The outer ring has no ribs and cannot locate the shaft axially; pair NU320 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "paper-machine dryer and calender rolls", "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Mount the 100 mm bore NU320 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU300 series at 100 mm bore (215×47 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.", "Catalogue reference speed and limiting speed are different limits: the 3,200 r/min reference is a thermal criterion under load, while the 3,800 r/min limiting value is the mechanical ceiling — observe both.", "The 7450 g mass and 47 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU320.", "The 450/440 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU320 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 320 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU320?", "a": "The NU 320 ECP is a single-row cylindrical roller bearing with 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 450 kN, C0 440 kN, fatigue load limit Pu 51 kN, reference speed 3,200 r/min, limiting speed 3,800 r/min, mass about 7450 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU320 bore code work?", "a": "The last two digits of NU320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 47 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU320?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU320 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU320 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU320-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "N320-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 320 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NJ320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 320 ECJ is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 320 ECJ is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU320 ECP", "NU320 ECP" ] }, { "sku": "NU2205", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 39, "static_load_kN": 34, "fatigue_load_limit_kN": 4.25, "max_rpm": 16000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 16000, "weight_g": 160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2205 ECP", "naming_rule_text": "NU2205 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, NU2205 reads as bearing type NU (single-row, inner ring separable), wide series 22, and bore reference 05 resolving to 25 mm; 52 mm OD and 18 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 39 kN and C0 34 kN, the NU2205 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.", "applications": [ "machine-tool spindle support (radial set)", "agricultural machinery power-take-off shafts", "automotive alternator and starter shafts", "small conveyor drum bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU2205 develops edge loading and early spalling.", "The NU2200 series at 25 mm bore (52×18 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Open NU2205 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The NU2205 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 39/34 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2205 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2205 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2205?", "a": "The NU 2205 ECP is a single-row cylindrical roller bearing with 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 39 kN, C0 34 kN, fatigue load limit Pu 4.25 kN, reference speed 15,000 r/min, limiting speed 16,000 r/min, mass about 160 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2205 bore code work?", "a": "The last two digits of NU2205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 18 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2205?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2205 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2205 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2205 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2205 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2205 ECP", "NU2205 ECP" ] }, { "sku": "NU2206", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 55, "static_load_kN": 49, "fatigue_load_limit_kN": 6.1, "max_rpm": 14000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 14000, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2206 ECP", "naming_rule_text": "The NU 2206 ECP is a 30×62×20 mm single-row cylindrical roller bearing — the wide entry in the NU2200 series, with separable inner ring and roller assembly for easy mounting. Numbering ties the bearing to its envelope: NU2206 means cylindrical-roller type NU, wide series 22, 30 mm bore — which is why the 62×20 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 6.1 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.89 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 30 mm bore (62×20 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 55/49 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2206 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2206 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2206?", "a": "The NU 2206 ECP is a single-row cylindrical roller bearing with 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 55 kN, C0 49 kN, fatigue load limit Pu 6.1 kN, reference speed 13,000 r/min, limiting speed 14,000 r/min, mass about 260 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2206 bore code work?", "a": "The last two digits of NU2206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 20 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2206?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2206 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2206 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2206 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2206 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2206 ECP", "NU2206 ECP" ] }, { "sku": "NU2207", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 63, "fatigue_load_limit_kN": 8.15, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2207 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2207 appears as NU 2207 ECP: an open, single-row cylindrical roller bearing in the NU2200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU2207 follows the ISO 15 convention: NU for the separable-inner-ring type, 22 for the wide, final digits 07 for the 35 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.91 (static 63 kN against dynamic 69.5 kN), typical of a cylindrical roller sized for high radial capacity, and the 8.15 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The outer ring has no ribs and cannot locate the shaft axially; pair NU2207 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 35 mm bore (72×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The NU2207 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "The 400 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2207.", "The 69.5/63 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2207 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2207 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2207?", "a": "The NU 2207 ECP is a single-row cylindrical roller bearing with 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.5 kN, C0 63 kN, fatigue load limit Pu 8.15 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 400 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2207 bore code work?", "a": "The last two digits of NU2207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2207?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2207 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2207 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2207 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2207 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2207 ECP", "NU2207 ECP" ] }, { "sku": "NU2208", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 81.5, "static_load_kN": 75, "fatigue_load_limit_kN": 9.65, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2208 ECP", "naming_rule_text": "NU 2208 ECP belongs to the SKF single-row cylindrical roller range — the 40 mm bore entry in the NU2200 series, dimensioned 80 mm OD and 23 mm wide to the ISO 15 boundary plan. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 08 = 40 mm; dimensions 40×80×23 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 20.0 mm radial section height ((80−40)/2) and 490 g catalogue mass frame a 40 mm bore bearing rated at 81.5 kN C — roughly 2.04 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 40 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 40 mm bore (80×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 80 mm race release as noise within the first running hours.", "The 81.5/75 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2208 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2208 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2208?", "a": "The NU 2208 ECP is a single-row cylindrical roller bearing with 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 81.5 kN, C0 75 kN, fatigue load limit Pu 9.65 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 490 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2208 bore code work?", "a": "The last two digits of NU2208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2208?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2208 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2208 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2208 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2208 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2208 ECP", "NU2208 ECP" ] }, { "sku": "NU2209", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 85, "static_load_kN": 81.5, "fatigue_load_limit_kN": 10.6, "max_rpm": 9500, "reference_speed_rpm": 9000, "limiting_speed_rpm": 9500, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2209 ECP", "naming_rule_text": "For a 45 mm shaft carrying pure radial load, SKF lists NU2209 under catalogue execution NU 2209 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 22 is the ISO 15 diameter/width series (wide), and the last two digits encode the 45 mm bore; the 85 mm OD and 23 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 520 g for the 45×85×23 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 45 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 45 mm bore (85×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The 520 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2209.", "Catalogue reference speed and limiting speed are different limits: the 9,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.", "The 85/81.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2209 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2209 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2209?", "a": "The NU 2209 ECP is a single-row cylindrical roller bearing with 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 85 kN, C0 81.5 kN, fatigue load limit Pu 10.6 kN, reference speed 9,000 r/min, limiting speed 9,500 r/min, mass about 520 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2209 bore code work?", "a": "The last two digits of NU2209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2209?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2209 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2209 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2209 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2209 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2209 ECP", "NU2209 ECP" ] }, { "sku": "NU2210", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 88, "fatigue_load_limit_kN": 11.4, "max_rpm": 9000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 9000, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2210 ECP", "naming_rule_text": "SKF NU2210 (NU 2210 ECP) is the wide cylindrical roller choice for a 50 mm shaft — one row of precisely profiled rollers on ground raceways inside the 90×23 mm ISO 15 envelope. On the SKF nameplate, NU2210 follows the ISO 15 convention: NU for the separable-inner-ring type, 22 for the wide, final digits 10 for the 50 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 8,500 r/min thermal reference and 9,000 r/min mechanical limiting speed. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 50 mm bore (90×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The 560 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2210.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 90 mm race release as noise within the first running hours.", "The 90/88 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2210 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2210 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2210?", "a": "The NU 2210 ECP is a single-row cylindrical roller bearing with 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 90 kN, C0 88 kN, fatigue load limit Pu 11.4 kN, reference speed 8,500 r/min, limiting speed 9,000 r/min, mass about 560 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2210 bore code work?", "a": "The last two digits of NU2210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2210?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2210 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2210 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2210 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2210 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2210 ECP", "NU2210 ECP" ] }, { "sku": "NU2211", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 114, "static_load_kN": 118, "fatigue_load_limit_kN": 15.3, "max_rpm": 8000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "weight_g": 790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2211 ECP", "naming_rule_text": "Ordering number NU 2211 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 55 mm shaft, wide section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 11 = 55 mm; dimensions 55×100×25 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 114 kN and C0 118 kN, the NU2211 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. The outer ring has no ribs and cannot locate the shaft axially; pair NU2211 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2200 series at 55 mm bore (100×25 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 100 mm race release as noise within the first running hours.", "Catalogue reference speed and limiting speed are different limits: the 7,500 r/min reference is a thermal criterion under load, while the 8,000 r/min limiting value is the mechanical ceiling — observe both.", "The 114/118 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2211 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2211 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2211?", "a": "The NU 2211 ECP is a single-row cylindrical roller bearing with 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 114 kN, C0 118 kN, fatigue load limit Pu 15.3 kN, reference speed 7,500 r/min, limiting speed 8,000 r/min, mass about 790 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2211 bore code work?", "a": "The last two digits of NU2211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2211?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2211 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2211 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2211 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2211 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2211 ECP", "NU2211 ECP" ] }, { "sku": "NU2212", "brand": "SKF", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 146, "static_load_kN": 153, "fatigue_load_limit_kN": 20, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2212 ECP", "naming_rule_text": "NU2212 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 22 is the ISO 15 diameter/width series (wide), and the last two digits encode the 60 mm bore; the 110 mm OD and 28 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 20 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.05 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 60 mm shaft typically takes a k5 seat with an H6 housing bore.", "applications": [ "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts", "large pump and turbine shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 60 mm bore NU2212 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU2200 series at 60 mm bore (110×28 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Catalogue reference speed and limiting speed are different limits: the 6,700 r/min reference is a thermal criterion under load, while the 7,500 r/min limiting value is the mechanical ceiling — observe both.", "Open NU2212 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 146/153 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2212 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2212 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2212?", "a": "The NU 2212 ECP is a single-row cylindrical roller bearing with 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 146 kN, C0 153 kN, fatigue load limit Pu 20 kN, reference speed 6,700 r/min, limiting speed 7,500 r/min, mass about 1050 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2212 bore code work?", "a": "The last two digits of NU2212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 28 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2212?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2212 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2212 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2212-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2212 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2212 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2212 ECP", "NU2212 ECP" ] }, { "sku": "NU2305", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 64, "static_load_kN": 55, "fatigue_load_limit_kN": 6.95, "max_rpm": 15000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "weight_g": 340, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2305 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2305 appears as NU 2305 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 23 is the ISO 15 diameter/width series (wide), and the last two digits encode the 25 mm bore; the 62 mm OD and 24 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 18.5 mm radial section height ((62−25)/2) and 340 g catalogue mass frame a 25 mm bore bearing rated at 64 kN C — roughly 2.56 kN of dynamic capacity per millimetre of bore before application factors. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.", "applications": [ "pump and compressor crankshafts", "machine-tool spindle support (radial set)", "agricultural machinery power-take-off shafts", "automotive alternator and starter shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU2305 develops edge loading and early spalling.", "The NU2300 series at 25 mm bore (62×24 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The 340 g mass and 24 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2305.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 64/55 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2305 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2305 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2305?", "a": "The NU 2305 ECP is a single-row cylindrical roller bearing with 25 mm bore, 62 mm outer diameter and 24 mm width (0.984 × 2.441 × 0.945 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 64 kN, C0 55 kN, fatigue load limit Pu 6.95 kN, reference speed 12,000 r/min, limiting speed 15,000 r/min, mass about 340 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2305 bore code work?", "a": "The last two digits of NU2305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 24 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2305?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2305 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2305 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2305 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2305 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2305 ECP", "NU2305 ECP" ] }, { "sku": "NU2306", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 83, "static_load_kN": 75, "fatigue_load_limit_kN": 9.65, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2306 ECP", "naming_rule_text": "NU 2306 ECP belongs to the SKF single-row cylindrical roller range — the 30 mm bore entry in the NU2300 series, dimensioned 72 mm OD and 27 mm wide to the ISO 15 boundary plan. Digit by digit, NU2306 reads as bearing type NU (single-row, inner ring separable), wide series 23, and bore reference 06 resolving to 30 mm; 72 mm OD and 27 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 530 g for the 30×72×27 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 30 mm bore (72×27 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 72 mm race release as noise within the first running hours.", "The 530 g mass and 27 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2306.", "The 83/75 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2306 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2306 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2306?", "a": "The NU 2306 ECP is a single-row cylindrical roller bearing with 30 mm bore, 72 mm outer diameter and 27 mm width (1.181 × 2.835 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 83 kN, C0 75 kN, fatigue load limit Pu 9.65 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 530 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2306 bore code work?", "a": "The last two digits of NU2306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 27 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2306?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2306 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2306 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2306 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2306 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2306 ECP", "NU2306 ECP" ] }, { "sku": "NU2307", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 106, "static_load_kN": 98, "fatigue_load_limit_kN": 12.7, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2307 ECP", "naming_rule_text": "For a 35 mm shaft carrying pure radial load, SKF lists NU2307 under catalogue execution NU 2307 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU2307 means cylindrical-roller type NU, wide series 23, 35 mm bore — which is why the 80×31 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 9,500 r/min reference speed the 22.5 mm-section NU2307 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 11,000 r/min as the mechanical ceiling. The outer ring has no ribs and cannot locate the shaft axially; pair NU2307 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "crane hoist and trolley wheel shafts", "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 35 mm bore (80×31 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.", "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 80 mm race release as noise within the first running hours.", "The 106/98 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2307 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2307 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2307?", "a": "The NU 2307 ECP is a single-row cylindrical roller bearing with 35 mm bore, 80 mm outer diameter and 31 mm width (1.378 × 3.15 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 106 kN, C0 98 kN, fatigue load limit Pu 12.7 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 720 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2307 bore code work?", "a": "The last two digits of NU2307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 31 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2307?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2307 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2307 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NJ2307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2307 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2307 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2307 ECP", "NU2307 ECP" ] }, { "sku": "NU2308", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 129, "static_load_kN": 120, "fatigue_load_limit_kN": 15.3, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2308 ECP", "naming_rule_text": "SKF NU2308 (NU 2308 ECP) is the wide cylindrical roller choice for a 40 mm shaft — one row of precisely profiled rollers on ground raceways inside the 90×33 mm ISO 15 envelope. On the SKF nameplate, NU2308 follows the ISO 15 convention: NU for the separable-inner-ring type, 23 for the wide, final digits 08 for the 40 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 8,000 r/min thermal reference and 9,500 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 40 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 40 mm bore (90×33 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Open NU2308 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "Catalogue reference speed and limiting speed are different limits: the 8,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.", "The 129/120 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2308 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2308 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2308?", "a": "The NU 2308 ECP is a single-row cylindrical roller bearing with 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 129 kN, C0 120 kN, fatigue load limit Pu 15.3 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 930 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2308 bore code work?", "a": "The last two digits of NU2308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 33 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2308?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2308 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2308 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2308-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2308 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2308 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2308 ECP", "NU2308 ECP" ] }, { "sku": "NU2309", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 160, "static_load_kN": 153, "fatigue_load_limit_kN": 20, "max_rpm": 8500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8500, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2309 ECP", "naming_rule_text": "Ordering number NU 2309 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 45 mm shaft, wide section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 23 (the wide), and bore code 09 = 45 mm; dimensions 45×100×36 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 160 kN and C0 153 kN, the NU2309 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. For a 45 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.", "applications": [ "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains", "crane hoist and trolley wheel shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 45 mm bore (100×36 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Open NU2309 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 160/153 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2309 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2309 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2309?", "a": "The NU 2309 ECP is a single-row cylindrical roller bearing with 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 160 kN, C0 153 kN, fatigue load limit Pu 20 kN, reference speed 7,500 r/min, limiting speed 8,500 r/min, mass about 1300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2309 bore code work?", "a": "The last two digits of NU2309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 36 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2309?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2309 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2309 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2309-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2309 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2309 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2309 ECP", "NU2309 ECP" ] }, { "sku": "NU2310", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 24.5, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2310 ECP", "naming_rule_text": "NU2310 is a single-row cylindrical roller bearing in the NU2300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: NU2310 means cylindrical-roller type NU, wide series 23, 50 mm bore — which is why the 110×40 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 1.00 (static 186 kN against dynamic 186 kN), typical of a cylindrical roller sized for high radial capacity, and the 24.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.", "applications": [ "industrial gearbox input/output shafts", "pump and compressor drive shafts", "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 50 mm bore (110×40 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "Catalogue reference speed and limiting speed are different limits: the 6,700 r/min reference is a thermal criterion under load, while the 8,000 r/min limiting value is the mechanical ceiling — observe both.", "The 186/186 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2310 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2310 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2310?", "a": "The NU 2310 ECP is a single-row cylindrical roller bearing with 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 186 kN, C0 186 kN, fatigue load limit Pu 24.5 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 1750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2310 bore code work?", "a": "The last two digits of NU2310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 40 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2310?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2310 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2310 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2310-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2310 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2310 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2310 ECP", "NU2310 ECP" ] }, { "sku": "NU2311", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 232, "static_load_kN": 232, "fatigue_load_limit_kN": 30.5, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2311 ECP", "naming_rule_text": "The NU 2311 ECP is a 55×120×43 mm single-row cylindrical roller bearing — the wide entry in the NU2300 series, with separable inner ring and roller assembly for easy mounting. On the SKF nameplate, NU2311 follows the ISO 15 convention: NU for the separable-inner-ring type, 23 for the wide, final digits 11 for the 55 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 32.5 mm radial section height ((120−55)/2) and 2250 g catalogue mass frame a 55 mm bore bearing rated at 232 kN C — roughly 4.22 kN of dynamic capacity per millimetre of bore before application factors. The outer ring has no ribs and cannot locate the shaft axially; pair NU2311 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.", "applications": [ "electric-motor shafts in pumps and fans", "machine-tool main spindles (radial set)", "paper-machine wet-section rolls", "rolling-mill auxiliary gear trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.", "The NU2300 series at 55 mm bore (120×43 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "The NU2311 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.", "Open NU2311 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.", "The 232/232 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2311 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2311 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2311?", "a": "The NU 2311 ECP is a single-row cylindrical roller bearing with 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 232 kN, C0 232 kN, fatigue load limit Pu 30.5 kN, reference speed 6,000 r/min, limiting speed 7,000 r/min, mass about 2250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2311 bore code work?", "a": "The last two digits of NU2311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 43 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2311?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2311 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2311 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2311-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2311 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2311 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2311 ECP", "NU2311 ECP" ] }, { "sku": "NU2312", "brand": "SKF", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 34.5, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "manufacturer_designation": "NU 2312 ECP", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2312 appears as NU 2312 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 23 (the wide), and bore code 12 = 60 mm; dimensions 60×130×46 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 2750 g for the 60×130×46 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 60 mm shaft typically takes a k5 seat with an H6 housing bore.", "applications": [ "cement-kiln support-roller shafts", "wind-turbine gearbox intermediate shafts", "marine propulsion gearbox shafts", "heavy industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Mount the 60 mm bore NU2312 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.", "The NU2300 series at 60 mm bore (130×46 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.", "The 260/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of NU2312 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2312 ECP designation when purchasing and match the execution to the speed and temperature requirements." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU2312?", "a": "The NU 2312 ECP is a single-row cylindrical roller bearing with 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 260 kN, C0 265 kN, fatigue load limit Pu 34.5 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 2750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage." }, { "q": "How does the NU2312 bore code work?", "a": "The last two digits of NU2312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 46 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code." }, { "q": "What does the ECP suffix mean on NU2312?", "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers." }, { "q": "Can NU2312 take axial load?", "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing." }, { "q": "How does NU2312 compare with a ball bearing of the same bore?", "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa." } ], "cross_ref": [ { "equiv_sku": "NU2312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ2312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2312 ECP is a different execution with its own cage/flange configuration." }, { "equiv_sku": "NUP2312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2312 ECP is a different execution with its own cage/flange configuration." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2312 ECP", "NU2312 ECP" ] }, { "sku": "22205", "brand": "SKF", "manufacturer_designation": "SKF 22205 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49.9, "static_load_kN": 44, "fatigue_load_limit_kN": 4.75, "max_rpm": 17000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 17000, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22205 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22205 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 05 for the 25 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 4.75 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.88 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 25 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "compactor and roller vibratory drums", "woodworking machine cutter spindles", "small vibrating screens and sieve shafts", "agricultural elevator and auger shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At a 25 mm bore the small barrel rollers skid readily at light load; keep the radial load above the minimum (roughly 0.01·C0) and avoid long idling at speed — unloaded 22205 rows scuff the raceway before fatigue ever shows.", "The 22200-series series at 25 mm bore (52×18 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Catalogue reference speed and limiting speed are different limits: the 13,000 r/min reference is a thermal criterion under load, while the 17,000 r/min limiting value is the mechanical ceiling — observe both.", "The 49.9/44 kN ratings are SKF catalogue values for this exact execution (22205 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22205 (cylindrical bore as listed, tapered-bore 22205 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22205 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22205?", "a": "The 22205 E is a double-row spherical roller bearing with 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 49.9 kN, C0 44 kN, fatigue load limit Pu 4.75 kN, reference speed 13,000 r/min, limiting speed 17,000 r/min, mass about 260 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22205 bore code work?", "a": "The last two digits of 22205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 18 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22205?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22205 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22205K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22205 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22205-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H305 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22205", "22205 E" ], "locale_variants": {} }, { "sku": "22206", "brand": "SKF", "manufacturer_designation": "SKF 22206 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.1, "static_load_kN": 60, "fatigue_load_limit_kN": 6.4, "max_rpm": 14000, "reference_speed_rpm": 10000, "limiting_speed_rpm": 14000, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 22206 E is a 30×62×20 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 30 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 06 = 30 mm; dimensions 30×62×20 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 0.91 (static 60 kN against dynamic 66.1 kN), typical of a spherical roller sized for heavy combined loads, and the 6.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 30 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "industrial gearbox output shafts", "centrifugal pump and fan shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "On this 30 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 30 mm bore (62×20 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Catalogue reference speed and limiting speed are different limits: the 10,000 r/min reference is a thermal criterion under load, while the 14,000 r/min limiting value is the mechanical ceiling — observe both.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22206 pits long before its L10 life.", "The 66.1/60 kN ratings are SKF catalogue values for this exact execution (22206 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22206 (cylindrical bore as listed, tapered-bore 22206 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22206 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22206?", "a": "The 22206 E is a double-row spherical roller bearing with 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 66.1 kN, C0 60 kN, fatigue load limit Pu 6.4 kN, reference speed 10,000 r/min, limiting speed 14,000 r/min, mass about 290 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22206 bore code work?", "a": "The last two digits of 22206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 20 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22206?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22206 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22206K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22206 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22206-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H306 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2206-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2206 TN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2206-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2206 KTN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2206-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2206 V shares the 30×62×20 mm envelope but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22206", "22206 E" ], "locale_variants": {} }, { "sku": "22207", "brand": "SKF", "manufacturer_designation": "SKF 22207 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 88.8, "static_load_kN": 85, "fatigue_load_limit_kN": 9.3, "max_rpm": 12000, "reference_speed_rpm": 9000, "limiting_speed_rpm": 12000, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22207 appears as 22207 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 35×72×23 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 35 mm bore; the 72 mm OD and 23 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 18.5 mm radial section height ((72−35)/2) and 450 g catalogue mass frame a 35 mm bore bearing rated at 88.8 kN C — roughly 2.54 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 22207 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "industrial gearbox output shafts", "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "continuous-caster guide rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "On this 35 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 35 mm bore (72×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22207 pits long before its L10 life.", "The 22207 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 88.8/85 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 88.8/85 kN ratings are SKF catalogue values for this exact execution (22207 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22207 (cylindrical bore as listed, tapered-bore 22207 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22207 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22207?", "a": "The 22207 E is a double-row spherical roller bearing with 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 88.8 kN, C0 85 kN, fatigue load limit Pu 9.3 kN, reference speed 9,000 r/min, limiting speed 12,000 r/min, mass about 450 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22207 bore code work?", "a": "The last two digits of 22207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22207?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22207 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22207K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22207 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22207-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H307 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2207-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2207 TN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2207-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2207 KTN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2207-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2207 V shares the 35×72×23 mm envelope but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22207", "22207 E" ], "locale_variants": {} }, { "sku": "22208", "brand": "SKF", "manufacturer_designation": "SKF 22208 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98.5, "static_load_kN": 90, "fatigue_load_limit_kN": 9.8, "max_rpm": 11000, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22208 E belongs to the SKF spherical roller range — the 40 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 80 mm OD and 23 mm wide. Digit by digit, 22208 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 08 resolving to 40 mm; 80 mm OD and 23 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 530 g for the 40×80×23 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22208 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "extruder gearbox shafts", "vibrating screen and scalper main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 40 mm bore (80×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22208 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 98.5/90 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 98.5/90 kN ratings are SKF catalogue values for this exact execution (22208 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22208 (cylindrical bore as listed, tapered-bore 22208 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22208 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22208?", "a": "The 22208 E is a double-row spherical roller bearing with 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 98.5 kN, C0 90 kN, fatigue load limit Pu 9.8 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 530 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22208 bore code work?", "a": "The last two digits of 22208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22208?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22208 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22208K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22208 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22208-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H308 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2208-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2208 TN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2208-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2208 KTN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2208-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2208 V shares the 40×80×23 mm envelope but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22208", "22208 E" ], "locale_variants": {} }, { "sku": "22209", "brand": "SKF", "manufacturer_designation": "SKF 22209 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 104, "static_load_kN": 98, "fatigue_load_limit_kN": 10.8, "max_rpm": 10000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 10000, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 45 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22209 under catalogue execution 22209 E: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 22209 means spherical-roller type, dimension series 22, 45 mm bore — which is why the 85×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 7,500 r/min reference speed the 20.0 mm-section 22209 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 10,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 45 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "extruder gearbox shafts", "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "industrial gearbox output shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 45 mm bore (85×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 580 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22209.", "The 104/98 kN ratings are SKF catalogue values for this exact execution (22209 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22209 (cylindrical bore as listed, tapered-bore 22209 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22209 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22209?", "a": "The 22209 E is a double-row spherical roller bearing with 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 104 kN, C0 98 kN, fatigue load limit Pu 10.8 kN, reference speed 7,500 r/min, limiting speed 10,000 r/min, mass about 580 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22209 bore code work?", "a": "The last two digits of 22209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22209?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22209 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22209K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22209 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22209-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H309 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2209-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 TN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2209-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 KTN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2209-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 V shares the 45×85×23 mm envelope but catalogue C/C0 differ (106/110 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22209", "22209 E" ], "locale_variants": {} }, { "sku": "22210", "brand": "SKF", "manufacturer_designation": "SKF 22210 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 108, "fatigue_load_limit_kN": 11.8, "max_rpm": 9500, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22210 (22210 E) is the spherical-roller choice for a 50 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 90×23 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 50 mm bore; the 90 mm OD and 23 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 107 kN and C0 108 kN, the 22210 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 50 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "continuous-caster guide rolls", "extruder gearbox shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 50 mm bore (90×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 107/108 kN ratings are SKF catalogue values for this exact execution (22210 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22210 (cylindrical bore as listed, tapered-bore 22210 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22210 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22210?", "a": "The 22210 E is a double-row spherical roller bearing with 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 107 kN, C0 108 kN, fatigue load limit Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 630 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22210 bore code work?", "a": "The last two digits of 22210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22210?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22210 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22210K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22210 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22210-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H310 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2210-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2210 TN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2210-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2210 KTN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2210-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2210 V shares the 50×90×23 mm envelope but catalogue C/C0 differ (114/122 kN vs 107/108 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22210", "22210 E" ], "locale_variants": {} }, { "sku": "22211", "brand": "SKF", "manufacturer_designation": "SKF 22211 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 127, "fatigue_load_limit_kN": 13.7, "max_rpm": 8500, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8500, "weight_g": 840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22211 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 55 mm shaft, dimension series 22 (medium OD, wide), with open execution and a stamped window-type steel cage. Digit by digit, 22211 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 11 resolving to 55 mm; 100 mm OD and 25 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 13.7 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.98 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 22211 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "continuous-caster guide rolls", "extruder gearbox shafts", "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 55 mm bore (100×25 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 840 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22211.", "The 840 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22211.", "The 129/127 kN ratings are SKF catalogue values for this exact execution (22211 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22211 (cylindrical bore as listed, tapered-bore 22211 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22211 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22211?", "a": "The 22211 E is a double-row spherical roller bearing with 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 129 kN, C0 127 kN, fatigue load limit Pu 13.7 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 840 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22211 bore code work?", "a": "The last two digits of 22211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22211?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22211 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22211K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22211 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22211-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H311 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2211-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2211 TN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2211-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2211 KTN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2211-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2211 V shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2211-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2211 KV shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22211", "22211 E" ], "locale_variants": {} }, { "sku": "22212", "brand": "SKF", "manufacturer_designation": "SKF 22212 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22212 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 22212 means spherical-roller type, dimension series 22, 60 mm bore — which is why the 110×28 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22212 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 60 mm bore 22212 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 60 mm bore (110×28 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22212; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22212; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 159/166 kN ratings are SKF catalogue values for this exact execution (22212 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22212 (cylindrical bore as listed, tapered-bore 22212 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22212 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22212?", "a": "The 22212 E is a double-row spherical roller bearing with 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1150 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22212 bore code work?", "a": "The last two digits of 22212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 28 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22212?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22212 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22212K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22212 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22212-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H312 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2212-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 TN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 KTN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 V shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 KV shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22212", "22212 E" ], "locale_variants": {} }, { "sku": "22213", "brand": "SKF", "manufacturer_designation": "SKF 22213 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 216, "fatigue_load_limit_kN": 24, "max_rpm": 7000, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7000, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 22213 E is a 65×120×31 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 65 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 22213 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 13 for the 65 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 27.5 mm radial section height ((120−65)/2) and 1550 g catalogue mass frame a 65 mm bore bearing rated at 198 kN C — roughly 3.05 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 65 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 65 mm bore 22213 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 65 mm bore (120×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 198/216 kN ratings are SKF catalogue values for this exact execution (22213 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22213 (cylindrical bore as listed, tapered-bore 22213 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22213 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22213?", "a": "The 22213 E is a double-row spherical roller bearing with 65 mm bore, 120 mm outer diameter and 31 mm width (2.559 × 4.724 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 198 kN, C0 216 kN, fatigue load limit Pu 24 kN, reference speed 5,000 r/min, limiting speed 7,000 r/min, mass about 1550 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22213 bore code work?", "a": "The last two digits of 22213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22213?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22213 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22213K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22213 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22213-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H313 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2213-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2213 TN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2213-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2213 KTN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2213-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2213 V shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2213-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2213 KV shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22213", "22213 E" ], "locale_variants": {} }, { "sku": "22214", "brand": "SKF", "manufacturer_designation": "SKF 22214 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 213, "static_load_kN": 228, "fatigue_load_limit_kN": 25.5, "max_rpm": 6700, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6700, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22214 appears as 22214 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 70×125×31 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 14 = 70 mm; dimensions 70×125×31 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 1550 g for the 70×125×31 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 31 mm width across two roller rows needs the full charge.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 70 mm bore 22214 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 70 mm bore (125×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Catalogue reference speed and limiting speed are different limits: the 5,000 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.", "Catalogue reference speed and limiting speed are different limits: the 5,000 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.", "The 213/228 kN ratings are SKF catalogue values for this exact execution (22214 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22214 (cylindrical bore as listed, tapered-bore 22214 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22214 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22214?", "a": "The 22214 E is a double-row spherical roller bearing with 70 mm bore, 125 mm outer diameter and 31 mm width (2.756 × 4.921 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 213 kN, C0 228 kN, fatigue load limit Pu 25.5 kN, reference speed 5,000 r/min, limiting speed 6,700 r/min, mass about 1550 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22214 bore code work?", "a": "The last two digits of 22214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22214?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22214 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22214K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22214 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22214-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H314 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2214-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2214 TN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2214-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2214 KTN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2214-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2214 V shares the 70×125×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22214", "22214 E" ], "locale_variants": {} }, { "sku": "22215", "brand": "SKF", "manufacturer_designation": "SKF 22215 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 217, "static_load_kN": 240, "fatigue_load_limit_kN": 26.5, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22215 E belongs to the SKF spherical roller range — the 75 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 130 mm OD and 31 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 75 mm bore; the 130 mm OD and 31 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 4,800 r/min reference speed the 27.5 mm-section 22215 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 75 mm bore 22215 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 75 mm bore (130×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22215 pits long before its L10 life.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22215 pits long before its L10 life.", "The 217/240 kN ratings are SKF catalogue values for this exact execution (22215 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22215 (cylindrical bore as listed, tapered-bore 22215 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22215 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22215?", "a": "The 22215 E is a double-row spherical roller bearing with 75 mm bore, 130 mm outer diameter and 31 mm width (2.953 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 217 kN, C0 240 kN, fatigue load limit Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1700 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22215 bore code work?", "a": "The last two digits of 22215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22215?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22215 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22215K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22215 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22215-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H315 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2215", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2215 shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2215-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2215 K shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2215-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2215 V shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2215-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2215 KV shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22215", "22215 E" ], "locale_variants": {} }, { "sku": "22216", "brand": "SKF", "manufacturer_designation": "SKF 22216 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 243, "static_load_kN": 270, "fatigue_load_limit_kN": 29, "max_rpm": 6000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22216 under catalogue execution 22216 E: two barrel-roller rows on a sphered outer raceway. Digit by digit, 22216 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 16 resolving to 80 mm; 140 mm OD and 33 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 80 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 80 mm bore 22216 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 80 mm bore (140×33 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22216 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 243/270 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 22216 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 243/270 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 243/270 kN ratings are SKF catalogue values for this exact execution (22216 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22216 (cylindrical bore as listed, tapered-bore 22216 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22216 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22216?", "a": "The 22216 E is a double-row spherical roller bearing with 80 mm bore, 140 mm outer diameter and 33 mm width (3.15 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 243 kN, C0 270 kN, fatigue load limit Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2100 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22216 bore code work?", "a": "The last two digits of 22216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22216?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22216 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22216K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22216 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22216-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H316 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2216", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 K shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 V shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 KV shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22216", "22216 E" ], "locale_variants": {} }, { "sku": "22217", "brand": "SKF", "manufacturer_designation": "SKF 22217 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22217 (22217 E) is the spherical-roller choice for a 85 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 150×36 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 22217 means spherical-roller type, dimension series 22, 85 mm bore — which is why the 150×36 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 291 kN and C0 325 kN, the 22217 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 85 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 85 mm bore 22217 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 85 mm bore (150×36 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 291/325 kN ratings are SKF catalogue values for this exact execution (22217 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22217 (cylindrical bore as listed, tapered-bore 22217 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22217 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22217?", "a": "The 22217 E is a double-row spherical roller bearing with 85 mm bore, 150 mm outer diameter and 36 mm width (3.346 × 5.906 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 2700 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22217 bore code work?", "a": "The last two digits of 22217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 36 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22217?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22217 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22217K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22217 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22217-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H317 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2217", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2217 shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2217-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2217 K shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22217", "22217 E" ], "locale_variants": {} }, { "sku": "22218", "brand": "SKF", "manufacturer_designation": "SKF 22218 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22218 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 90 mm shaft, dimension series 22 (medium OD, wide), with open execution and a stamped window-type steel cage. On the SKF nameplate, 22218 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 18 for the 90 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 39 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.13 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 22218 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 90 mm bore 22218 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 90 mm bore (160×40 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 3400 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218.", "The 3400 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218.", "The 331/375 kN ratings are SKF catalogue values for this exact execution (22218 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22218 (cylindrical bore as listed, tapered-bore 22218 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22218 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22218?", "a": "The 22218 E is a double-row spherical roller bearing with 90 mm bore, 160 mm outer diameter and 40 mm width (3.543 × 6.299 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 3400 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22218 bore code work?", "a": "The last two digits of 22218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22218?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22218 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22218K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22218 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22218-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H318 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2218", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2218 shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2218-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2218 K shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22218", "22218 E" ], "locale_variants": {} }, { "sku": "22219", "brand": "SKF", "manufacturer_designation": "SKF 22219 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 393, "static_load_kN": 450, "fatigue_load_limit_kN": 45.5, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 4150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22219 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 19 = 95 mm; dimensions 95×170×43 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.15 (static 450 kN against dynamic 393 kN), typical of a spherical roller sized for heavy combined loads, and the 45.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22219 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 95 mm bore 22219 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 95 mm bore (170×43 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 393/450 kN ratings are SKF catalogue values for this exact execution (22219 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22219 (cylindrical bore as listed, tapered-bore 22219 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22219 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22219?", "a": "The 22219 E is a double-row spherical roller bearing with 95 mm bore, 170 mm outer diameter and 43 mm width (3.74 × 6.693 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 393 kN, C0 450 kN, fatigue load limit Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 4150 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22219 bore code work?", "a": "The last two digits of 22219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22219?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22219 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22219K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22219 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22219-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H319 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22219", "22219 E" ], "locale_variants": {} }, { "sku": "22220", "brand": "SKF", "manufacturer_designation": "SKF 22220 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 4900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 22220 E is a 100×180×46 mm spherical roller bearing — the dimension series 22 (medium OD, wide) entry for a 100 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 22220 means spherical-roller type, dimension series 22, 100 mm bore — which is why the 180×46 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 4900 g for the 100×180×46 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 100 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 100 mm bore 22220 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 100 mm bore (180×46 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22220; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 4900 g mass and 46 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22220.", "The 433/490 kN ratings are SKF catalogue values for this exact execution (22220 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22220 (cylindrical bore as listed, tapered-bore 22220 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22220 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22220?", "a": "The 22220 E is a double-row spherical roller bearing with 100 mm bore, 180 mm outer diameter and 46 mm width (3.937 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 4900 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22220 bore code work?", "a": "The last two digits of 22220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22220?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22220 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22220K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22220 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22220-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H320 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2220", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2220 shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2220-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2220 K shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22220", "22220 E" ], "locale_variants": {} }, { "sku": "22222", "brand": "SKF", "manufacturer_designation": "SKF 22222 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 572, "static_load_kN": 640, "fatigue_load_limit_kN": 63, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22222 E belongs to the SKF spherical roller range — the 110 mm bore entry in the 22200-series series (dimension series 22 (medium OD, wide)), dimensioned 200 mm OD and 53 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 22 = 110 mm; dimensions 110×200×53 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 3,000 r/min thermal reference and 4,000 r/min mechanical limiting speed. After mounting, swing the outer ring to confirm free self-alignment: the 22222 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 110 mm bore 22222 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 110 mm bore (200×53 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Catalogue reference speed and limiting speed are different limits: the 3,000 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 572/640 kN ratings are SKF catalogue values for this exact execution (22222 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22222 (cylindrical bore as listed, tapered-bore 22222 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22222 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22222?", "a": "The 22222 E is a double-row spherical roller bearing with 110 mm bore, 200 mm outer diameter and 53 mm width (4.331 × 7.874 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 572 kN, C0 640 kN, fatigue load limit Pu 63 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 7000 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22222 bore code work?", "a": "The last two digits of 22222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 53 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22222?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22222 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22222K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22222 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22222-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H322 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2222", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2222 shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2222-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2222 K shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22222", "22222 E" ], "locale_variants": {} }, { "sku": "22224", "brand": "SKF", "manufacturer_designation": "SKF 22224 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 652, "static_load_kN": 765, "fatigue_load_limit_kN": 73.5, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 8700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22224 (22224 E) is the spherical-roller choice for a 120 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 215×58 mm ISO 15 envelope. Digit by digit, 22224 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 24 resolving to 120 mm; 215 mm OD and 58 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 73.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.17 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 120 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 120 mm bore (215×58 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22224 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 652/765 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22224 pits long before its L10 life.", "The 652/765 kN ratings are SKF catalogue values for this exact execution (22224 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22224 (cylindrical bore as listed, tapered-bore 22224 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22224 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22224?", "a": "The 22224 E is a double-row spherical roller bearing with 120 mm bore, 215 mm outer diameter and 58 mm width (4.724 × 8.465 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 652 kN, C0 765 kN, fatigue load limit Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 8700 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22224 bore code work?", "a": "The last two digits of 22224 are bore code 24, so 24 × 5 = 120 mm bore. The 215 mm OD and 58 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22224?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22224 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22224K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22224 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22224-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3124 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22224", "22224 E" ], "locale_variants": {} }, { "sku": "22226", "brand": "SKF", "manufacturer_designation": "SKF 22226 E", "series": "22200-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 758, "static_load_kN": 930, "fatigue_load_limit_kN": 88, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22226 is a double-row spherical roller bearing in the 22200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22226 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 26 for the 130 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 50.0 mm radial section height ((230−130)/2) and 11000 g catalogue mass frame a 130 mm bore bearing rated at 758 kN C — roughly 5.83 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 130 mm bore (230×64 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 11000 g mass and 64 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22226.", "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 758/930 kN ratings are SKF catalogue values for this exact execution (22226 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22226 (cylindrical bore as listed, tapered-bore 22226 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22226 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22226?", "a": "The 22226 E is a double-row spherical roller bearing with 130 mm bore, 230 mm outer diameter and 64 mm width (5.118 × 9.055 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 758 kN, C0 930 kN, fatigue load limit Pu 88 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 11000 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22226 bore code work?", "a": "The last two digits of 22226 are bore code 26, so 26 × 5 = 130 mm bore. The 230 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22226?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22226 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22226K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22226 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22226-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3126 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2226", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2226 shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2226-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2226 K shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22226", "22226 E" ], "locale_variants": {} }, { "sku": "22228", "brand": "SKF", "manufacturer_designation": "SKF 22228 CC/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 743, "static_load_kN": 900, "fatigue_load_limit_kN": 86.5, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22228 appears as 22228 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 140×250×68 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 140 mm bore; the 250 mm OD and 68 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,400 r/min reference speed the 55.0 mm-section 22228 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,200 r/min as the mechanical ceiling. A 140 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 140 mm bore (250×68 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22228; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 743/900 kN ratings are SKF catalogue values for this exact execution (22228 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22228 (cylindrical bore as listed, tapered-bore 22228 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22228 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22228?", "a": "The 22228 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 743 kN, C0 900 kN, fatigue load limit Pu 86.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 14000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22228 bore code work?", "a": "The last two digits of 22228 are bore code 28, so 28 × 5 = 140 mm bore. The 250 mm OD and 68 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22228?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22228 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22228K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22228 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22228-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3128 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2228", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2228 shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2228-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2228 K shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22228", "22228 CC/W33" ], "locale_variants": {} }, { "sku": "22230", "brand": "SKF", "manufacturer_designation": "SKF 22230 CC/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 898, "static_load_kN": 1080, "fatigue_load_limit_kN": 102, "max_rpm": 3000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3000, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22230 under catalogue execution 22230 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 30 = 150 mm; dimensions 150×270×73 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 102 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.20 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 150 mm bore (270×73 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22230; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 898/1080 kN ratings are SKF catalogue values for this exact execution (22230 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22230 (cylindrical bore as listed, tapered-bore 22230 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22230 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22230?", "a": "The 22230 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 270 mm outer diameter and 73 mm width (5.906 × 10.63 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 898 kN, C0 1080 kN, fatigue load limit Pu 102 kN, reference speed 2,200 r/min, limiting speed 3,000 r/min, mass about 18000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22230 bore code work?", "a": "The last two digits of 22230 are bore code 30, so 30 × 5 = 150 mm bore. The 270 mm OD and 73 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22230?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22230 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22230K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22230 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22230-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3130 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2230", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2230 shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2230-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2230 K shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22230", "22230 CC/W33" ], "locale_variants": {} }, { "sku": "22232", "brand": "SKF", "manufacturer_designation": "SKF 22232 CC/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1043, "static_load_kN": 1290, "fatigue_load_limit_kN": 118, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22232 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 160 mm shaft, dimension series 22 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 22232 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 32 resolving to 160 mm; 290 mm OD and 80 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 65.0 mm radial section height ((290−160)/2) and 22500 g catalogue mass frame a 160 mm bore bearing rated at 1043 kN C — roughly 6.52 kN of dynamic capacity per millimetre of bore before application factors. A 160 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 160 mm bore (290×80 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22232 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1043/1290 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.", "The 1043/1290 kN ratings are SKF catalogue values for this exact execution (22232 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22232 (cylindrical bore as listed, tapered-bore 22232 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22232 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22232?", "a": "The 22232 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 290 mm outer diameter and 80 mm width (6.299 × 11.417 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1043 kN, C0 1290 kN, fatigue load limit Pu 118 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 22500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22232 bore code work?", "a": "The last two digits of 22232 are bore code 32, so 32 × 5 = 160 mm bore. The 290 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 22 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22232?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22232 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22232K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22232 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22232-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3132 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22232", "22232 CC/W33" ], "locale_variants": {} }, { "sku": "22308", "brand": "SKF", "manufacturer_designation": "SKF 22308 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 155, "static_load_kN": 140, "fatigue_load_limit_kN": 15, "max_rpm": 8000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 8000, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22308 (22308 E) is the spherical-roller choice for a 40 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 90×33 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 40 mm bore; the 90 mm OD and 33 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 25.0 mm radial section height ((90−40)/2) and 1050 g catalogue mass frame a 40 mm bore bearing rated at 155 kN C — roughly 3.88 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 40 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "industrial gearbox output shafts", "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "continuous-caster guide rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 40 mm bore (90×33 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 8,000 r/min ceiling.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 155/140 kN ratings are SKF catalogue values for this exact execution (22308 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22308 (cylindrical bore as listed, tapered-bore 22308 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22308 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22308?", "a": "The 22308 E is a double-row spherical roller bearing with 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 155 kN, C0 140 kN, fatigue load limit Pu 15 kN, reference speed 6,000 r/min, limiting speed 8,000 r/min, mass about 1050 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22308 bore code work?", "a": "The last two digits of 22308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22308?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22308 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22308K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22308 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22308-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2308 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22308", "22308 E" ], "locale_variants": {} }, { "sku": "22309", "brand": "SKF", "manufacturer_designation": "SKF 22309 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 190, "static_load_kN": 183, "fatigue_load_limit_kN": 19.6, "max_rpm": 7000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7000, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22309 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 45 mm shaft, dimension series 23 (heavy OD, wide), with open execution and a stamped window-type steel cage. Digit by digit, 22309 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 09 resolving to 45 mm; 100 mm OD and 36 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 1400 g for the 45×100×36 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 45 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "extruder gearbox shafts", "vibrating screen and scalper main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 45 mm bore (100×36 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 7,000 r/min ceiling.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.", "The 190/183 kN ratings are SKF catalogue values for this exact execution (22309 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22309 (cylindrical bore as listed, tapered-bore 22309 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22309 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22309?", "a": "The 22309 E is a double-row spherical roller bearing with 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 190 kN, C0 183 kN, fatigue load limit Pu 19.6 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 1400 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22309 bore code work?", "a": "The last two digits of 22309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 36 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22309?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22309 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22309K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22309 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22309-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2309 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22309", "22309 E" ], "locale_variants": {} }, { "sku": "22310", "brand": "SKF", "manufacturer_designation": "SKF 22310 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 228, "static_load_kN": 224, "fatigue_load_limit_kN": 24, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22310 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 10 = 50 mm; dimensions 50×110×40 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 4,800 r/min thermal reference and 6,300 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 40 mm width across two roller rows needs the full charge.", "applications": [ "conveyor drive and bend pulleys", "industrial gearbox output shafts", "centrifugal pump and fan shafts", "hammer-mill and crusher rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 50 mm bore (110×40 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 6,300 r/min ceiling.", "Catalogue reference speed and limiting speed are different limits: the 4,800 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 228/224 kN ratings are SKF catalogue values for this exact execution (22310 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22310 (cylindrical bore as listed, tapered-bore 22310 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22310 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22310?", "a": "The 22310 E is a double-row spherical roller bearing with 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 228 kN, C0 224 kN, fatigue load limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1900 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22310 bore code work?", "a": "The last two digits of 22310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22310?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22310 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22310K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22310 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22310-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2310 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22310", "22310 E" ], "locale_variants": {} }, { "sku": "22311", "brand": "SKF", "manufacturer_designation": "SKF 22311 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 280, "static_load_kN": 280, "fatigue_load_limit_kN": 30, "max_rpm": 5600, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5600, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 22311 E is a 55×120×43 mm spherical roller bearing — the dimension series 23 (heavy OD, wide) entry for a 55 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 55 mm bore; the 120 mm OD and 43 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 280 kN and C0 280 kN, the 22311 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "continuous-caster guide rolls", "extruder gearbox shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 55 mm bore (120×43 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,600 r/min ceiling.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22311 pits long before its L10 life.", "Catalogue reference speed and limiting speed are different limits: the 4,300 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.", "The 280/280 kN ratings are SKF catalogue values for this exact execution (22311 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22311 (cylindrical bore as listed, tapered-bore 22311 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22311 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22311?", "a": "The 22311 E is a double-row spherical roller bearing with 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 280 kN, C0 280 kN, fatigue load limit Pu 30 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 2450 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22311 bore code work?", "a": "The last two digits of 22311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22311?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22311 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22311K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22311 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22311-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2311 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22311", "22311 E" ], "locale_variants": {} }, { "sku": "22312", "brand": "SKF", "manufacturer_designation": "SKF 22312 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "max_rpm": 5300, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5300, "weight_g": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22312 appears as 22312 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 60×130×46 mm to the ISO 15 boundary plan. Digit by digit, 22312 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 12 resolving to 60 mm; 130 mm OD and 46 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 36 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.03 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 60 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 60 mm bore 22312 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 60 mm bore (130×46 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,300 r/min ceiling.", "The 22312 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 325/335 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22312 pits long before its L10 life.", "The 325/335 kN ratings are SKF catalogue values for this exact execution (22312 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22312 (cylindrical bore as listed, tapered-bore 22312 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22312 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22312?", "a": "The 22312 E is a double-row spherical roller bearing with 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 325 kN, C0 335 kN, fatigue load limit Pu 36 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 3100 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22312 bore code work?", "a": "The last two digits of 22312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22312?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22312 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22312K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22312 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22312-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2312 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22312", "22312 E" ], "locale_variants": {} }, { "sku": "22313", "brand": "SKF", "manufacturer_designation": "SKF 22313 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 357, "static_load_kN": 360, "fatigue_load_limit_kN": 38, "max_rpm": 5000, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5000, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22313 E belongs to the SKF spherical roller range — the 65 mm bore entry in the 22300-series series (dimension series 23 (heavy OD, wide)), dimensioned 140 mm OD and 48 mm wide. Numbering ties the bearing to its envelope: 22313 means spherical-roller type, dimension series 23, 65 mm bore — which is why the 140×48 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Selection arithmetic: the C0/C ratio is about 1.01 (static 360 kN against dynamic 357 kN), typical of a spherical roller sized for heavy combined loads, and the 38 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 65 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 65 mm bore 22313 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 65 mm bore (140×48 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,000 r/min ceiling.", "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 22313 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 357/360 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 357/360 kN ratings are SKF catalogue values for this exact execution (22313 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22313 (cylindrical bore as listed, tapered-bore 22313 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22313 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22313?", "a": "The 22313 E is a double-row spherical roller bearing with 65 mm bore, 140 mm outer diameter and 48 mm width (2.559 × 5.512 × 1.89 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 357 kN, C0 360 kN, fatigue load limit Pu 38 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 3750 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22313 bore code work?", "a": "The last two digits of 22313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 48 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22313?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22313 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22313K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22313 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22313-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2313 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22313", "22313 E" ], "locale_variants": {} }, { "sku": "22314", "brand": "SKF", "manufacturer_designation": "SKF 22314 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 413, "static_load_kN": 430, "fatigue_load_limit_kN": 45, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 4550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 70 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22314 under catalogue execution 22314 E: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 22314 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 14 for the 70 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 40.0 mm radial section height ((150−70)/2) and 4550 g catalogue mass frame a 70 mm bore bearing rated at 413 kN C — roughly 5.90 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 22314 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 70 mm bore 22314 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 70 mm bore (150×51 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,500 r/min ceiling.", "The 4550 g mass and 51 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22314.", "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 413/430 kN ratings are SKF catalogue values for this exact execution (22314 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22314 (cylindrical bore as listed, tapered-bore 22314 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22314 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22314?", "a": "The 22314 E is a double-row spherical roller bearing with 70 mm bore, 150 mm outer diameter and 51 mm width (2.756 × 5.906 × 2.008 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 413 kN, C0 430 kN, fatigue load limit Pu 45 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 4550 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22314 bore code work?", "a": "The last two digits of 22314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 51 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22314?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22314 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22314K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22314 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22314-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2314 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2314", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2314 shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2314-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2314 K shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22314", "22314 E" ], "locale_variants": {} }, { "sku": "22315", "brand": "SKF", "manufacturer_designation": "SKF 22315 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 462, "static_load_kN": 475, "fatigue_load_limit_kN": 48, "max_rpm": 4300, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "weight_g": 5550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22315 (22315 E) is the spherical-roller choice for a 75 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 160×55 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 15 = 75 mm; dimensions 75×160×55 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 5550 g for the 75×160×55 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22315 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 75 mm bore 22315 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 75 mm bore (160×55 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,300 r/min ceiling.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22315; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 5550 g mass and 55 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22315.", "The 462/475 kN ratings are SKF catalogue values for this exact execution (22315 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22315 (cylindrical bore as listed, tapered-bore 22315 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22315 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22315?", "a": "The 22315 E is a double-row spherical roller bearing with 75 mm bore, 160 mm outer diameter and 55 mm width (2.953 × 6.299 × 2.165 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 462 kN, C0 475 kN, fatigue load limit Pu 48 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 5550 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22315 bore code work?", "a": "The last two digits of 22315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 55 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22315?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22315 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22315K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22315 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22315-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2315 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2315", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2315 shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2315-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2315 K shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22315", "22315 E" ], "locale_variants": {} }, { "sku": "22316", "brand": "SKF", "manufacturer_designation": "SKF 22316 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 516, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 6600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22316 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 80 mm shaft, dimension series 23 (heavy OD, wide), with open execution and a stamped window-type steel cage. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 80 mm bore; the 170 mm OD and 58 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 3,000 r/min reference speed the 45.0 mm-section 22316 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 80 mm bore 22316 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 80 mm bore (170×58 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,000 r/min ceiling.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22316; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 516/530 kN ratings are SKF catalogue values for this exact execution (22316 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22316 (cylindrical bore as listed, tapered-bore 22316 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22316 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22316?", "a": "The 22316 E is a double-row spherical roller bearing with 80 mm bore, 170 mm outer diameter and 58 mm width (3.15 × 6.693 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 516 kN, C0 530 kN, fatigue load limit Pu 54 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 6600 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22316 bore code work?", "a": "The last two digits of 22316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 58 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22316?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22316 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22316K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22316 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22316-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2316 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2316", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2316 shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2316-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2316 K shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22316", "22316 E" ], "locale_variants": {} }, { "sku": "22317", "brand": "SKF", "manufacturer_designation": "SKF 22317 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 577, "static_load_kN": 620, "fatigue_load_limit_kN": 61, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 7650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22317 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 22317 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 17 resolving to 85 mm; 180 mm OD and 60 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 2,800 r/min thermal reference and 3,800 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 60 mm width across two roller rows needs the full charge.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 85 mm bore 22317 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 85 mm bore (180×60 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,800 r/min ceiling.", "Catalogue reference speed and limiting speed are different limits: the 2,800 r/min reference is a thermal criterion under load, while the 3,800 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 577/620 kN ratings are SKF catalogue values for this exact execution (22317 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22317 (cylindrical bore as listed, tapered-bore 22317 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22317 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22317?", "a": "The 22317 E is a double-row spherical roller bearing with 85 mm bore, 180 mm outer diameter and 60 mm width (3.346 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 577 kN, C0 620 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 7650 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22317 bore code work?", "a": "The last two digits of 22317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22317?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22317 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22317K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22317 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22317-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2317 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2317", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2317 shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2317-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2317 K shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22317", "22317 E" ], "locale_variants": {} }, { "sku": "22318", "brand": "SKF", "manufacturer_designation": "SKF 22318 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 637, "static_load_kN": 695, "fatigue_load_limit_kN": 67, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 9050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 22318 E is a 90×190×64 mm spherical roller bearing — the dimension series 23 (heavy OD, wide) entry for a 90 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 22318 means spherical-roller type, dimension series 23, 90 mm bore — which is why the 190×64 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 637 kN and C0 695 kN, the 22318 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 90 mm bore 22318 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 90 mm bore (190×64 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,600 r/min ceiling.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22318 pits long before its L10 life.", "Catalogue reference speed and limiting speed are different limits: the 2,600 r/min reference is a thermal criterion under load, while the 3,600 r/min limiting value is the mechanical ceiling — observe both.", "The 637/695 kN ratings are SKF catalogue values for this exact execution (22318 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22318 (cylindrical bore as listed, tapered-bore 22318 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22318 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22318?", "a": "The 22318 E is a double-row spherical roller bearing with 90 mm bore, 190 mm outer diameter and 64 mm width (3.543 × 7.48 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 637 kN, C0 695 kN, fatigue load limit Pu 67 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 9050 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22318 bore code work?", "a": "The last two digits of 22318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22318?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22318 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22318K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22318 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22318-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2318 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2318", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2318 shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2318-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2318 K shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22318", "22318 E" ], "locale_variants": {} }, { "sku": "22319", "brand": "SKF", "manufacturer_designation": "SKF 22319 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 699, "static_load_kN": 765, "fatigue_load_limit_kN": 73.5, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22319 appears as 22319 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 95×200×67 mm to the ISO 15 boundary plan. On the SKF nameplate, 22319 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 19 for the 95 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 73.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.09 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 95 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 95 mm bore 22319 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 95 mm bore (200×67 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,400 r/min ceiling.", "The 22319 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 699/765 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22319 pits long before its L10 life.", "The 699/765 kN ratings are SKF catalogue values for this exact execution (22319 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22319 (cylindrical bore as listed, tapered-bore 22319 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22319 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22319?", "a": "The 22319 E is a double-row spherical roller bearing with 95 mm bore, 200 mm outer diameter and 67 mm width (3.74 × 7.874 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 699 kN, C0 765 kN, fatigue load limit Pu 73.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 10500 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22319 bore code work?", "a": "The last two digits of 22319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 67 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22319?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22319 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22319K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22319 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22319-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2319 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2319", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2319 shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2319-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2319 K shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22319", "22319 E" ], "locale_variants": {} }, { "sku": "22320", "brand": "SKF", "manufacturer_designation": "SKF 22320 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 847, "static_load_kN": 950, "fatigue_load_limit_kN": 88, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22320 E belongs to the SKF spherical roller range — the 100 mm bore entry in the 22300-series series (dimension series 23 (heavy OD, wide)), dimensioned 215 mm OD and 73 mm wide. Digit by digit, 22320 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 20 resolving to 100 mm; 215 mm OD and 73 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 57.5 mm radial section height ((215−100)/2) and 13500 g catalogue mass frame a 100 mm bore bearing rated at 847 kN C — roughly 8.47 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 100 mm bore 22320 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 100 mm bore (215×73 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,000 r/min ceiling.", "The 22320 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 847/950 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.", "The 847/950 kN ratings are SKF catalogue values for this exact execution (22320 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22320 (cylindrical bore as listed, tapered-bore 22320 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22320 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22320?", "a": "The 22320 E is a double-row spherical roller bearing with 100 mm bore, 215 mm outer diameter and 73 mm width (3.937 × 8.465 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 847 kN, C0 950 kN, fatigue load limit Pu 88 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 13500 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22320 bore code work?", "a": "The last two digits of 22320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 73 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22320?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22320 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22320K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22320 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22320-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2320 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2320", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2320 shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2320-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2320 K shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22320", "22320 E" ], "locale_variants": {} }, { "sku": "22322", "brand": "SKF", "manufacturer_designation": "SKF 22322 E", "series": "22300-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 989, "static_load_kN": 1120, "fatigue_load_limit_kN": 100, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 22322 (22322 E) is the spherical-roller choice for a 110 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 240×80 mm ISO 15 envelope. On the SKF nameplate, 22322 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 22 for the 110 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 2,000 r/min reference speed the 65.0 mm-section 22322 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 110 mm bore 22322 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 110 mm bore (240×80 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,800 r/min ceiling.", "The 18500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22322.", "The 22322 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 989/1120 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 989/1120 kN ratings are SKF catalogue values for this exact execution (22322 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22322 (cylindrical bore as listed, tapered-bore 22322 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22322 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22322?", "a": "The 22322 E is a double-row spherical roller bearing with 110 mm bore, 240 mm outer diameter and 80 mm width (4.331 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 989 kN, C0 1120 kN, fatigue load limit Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 18500 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 22322 bore code work?", "a": "The last two digits of 22322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 22322?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 22322 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22322K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22322 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22322-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2322 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22322", "22322 E" ], "locale_variants": {} }, { "sku": "22324", "brand": "SKF", "manufacturer_designation": "SKF 22324 CC/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1019, "static_load_kN": 1120, "fatigue_load_limit_kN": 100, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22324 is a double-row spherical roller bearing in the 22300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 120 mm bore; the 260 mm OD and 86 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1019 kN and C0 1120 kN, the 22324 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 120 mm bore (260×86 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,600 r/min ceiling.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 23000 g mass and 86 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22324.", "The 1019/1120 kN ratings are SKF catalogue values for this exact execution (22324 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22324 (cylindrical bore as listed, tapered-bore 22324 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22324 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22324?", "a": "The 22324 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 260 mm outer diameter and 86 mm width (4.724 × 10.236 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1019 kN, C0 1120 kN, fatigue load limit Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 23000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22324 bore code work?", "a": "The last two digits of 22324 are bore code 24, so 24 × 5 = 120 mm bore. The 260 mm OD and 86 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22324?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22324 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22324K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22324 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22324-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX2324 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22324", "22324 CC/W33" ], "locale_variants": {} }, { "sku": "22326", "brand": "SKF", "manufacturer_designation": "SKF 22326 CC/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1176, "static_load_kN": 1320, "fatigue_load_limit_kN": 114, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22326 appears as 22326 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 130×280×93 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 22326 means spherical-roller type, dimension series 23, 130 mm bore — which is why the 280×93 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Selection arithmetic: the C0/C ratio is about 1.12 (static 1320 kN against dynamic 1176 kN), typical of a spherical roller sized for heavy combined loads, and the 114 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22326 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 130 mm bore (280×93 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,400 r/min ceiling.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22326 pits long before its L10 life.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1176/1320 kN ratings are SKF catalogue values for this exact execution (22326 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22326 (cylindrical bore as listed, tapered-bore 22326 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22326 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22326?", "a": "The 22326 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 280 mm outer diameter and 93 mm width (5.118 × 11.024 × 3.661 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1176 kN, C0 1320 kN, fatigue load limit Pu 114 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22326 bore code work?", "a": "The last two digits of 22326 are bore code 26, so 26 × 5 = 130 mm bore. The 280 mm OD and 93 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22326?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22326 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22326K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22326 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22326-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX2326 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C2326-K-VE240", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2326 K/VE240 shares the 130×280×93 mm envelope but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22326", "22326 CC/W33" ], "locale_variants": {} }, { "sku": "22328", "brand": "SKF", "manufacturer_designation": "SKF 22328 CC/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1357, "static_load_kN": 1560, "fatigue_load_limit_kN": 132, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 140 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 22328 under catalogue execution 22328 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 28 = 140 mm; dimensions 140×300×102 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Catalogue mass 36500 g for the 140×300×102 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 102 mm width across two roller rows needs the full charge.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 140 mm bore (300×102 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,200 r/min ceiling.", "Shaft and housing fillets must clear the bearing chamfer so the 102 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22328 pits long before its L10 life.", "The 1357/1560 kN ratings are SKF catalogue values for this exact execution (22328 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22328 (cylindrical bore as listed, tapered-bore 22328 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22328 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22328?", "a": "The 22328 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 300 mm outer diameter and 102 mm width (5.512 × 11.811 × 4.016 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1357 kN, C0 1560 kN, fatigue load limit Pu 132 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 36500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22328 bore code work?", "a": "The last two digits of 22328 are bore code 28, so 28 × 5 = 140 mm bore. The 300 mm OD and 102 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22328?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22328 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22328K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22328 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22328-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX2328 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22328", "22328 CC/W33" ], "locale_variants": {} }, { "sku": "22330", "brand": "SKF", "manufacturer_designation": "SKF 22330 CC/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1539, "static_load_kN": 1760, "fatigue_load_limit_kN": 146, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 43500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 22330 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 150 mm shaft, dimension series 23 (heavy OD, wide), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 22330 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 30 for the 150 mm bore. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1539 kN and C0 1760 kN, the 22330 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 22330 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 150 mm bore (320×108 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,000 r/min ceiling.", "The 43500 g mass and 108 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22330.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22330 pits long before its L10 life.", "The 1539/1760 kN ratings are SKF catalogue values for this exact execution (22330 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 22330 (cylindrical bore as listed, tapered-bore 22330 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 22330 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22330?", "a": "The 22330 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 320 mm outer diameter and 108 mm width (5.906 × 12.598 × 4.252 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1539 kN, C0 1760 kN, fatigue load limit Pu 146 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 43500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 22330 bore code work?", "a": "The last two digits of 22330 are bore code 30, so 30 × 5 = 150 mm bore. The 320 mm OD and 108 mm width come from the ISO 15 dimension-series plan (dimension series 23 (heavy OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 22330?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 22330 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 22330K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 22330 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "22330-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2330 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22330", "22330 CC/W33" ], "locale_variants": {} }, { "sku": "21310", "brand": "SKF", "manufacturer_designation": "SKF 21310 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21310 appears as 21310 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 50×110×27 mm to the ISO 15 boundary plan. Digit by digit, 21310 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 10 resolving to 50 mm; 110 mm OD and 27 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 30.0 mm radial section height ((110−50)/2) and 1350 g catalogue mass frame a 50 mm bore bearing rated at 159 kN C — roughly 3.18 kN of dynamic capacity per millimetre of bore before application factors. A 50 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "industrial gearbox output shafts", "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "continuous-caster guide rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 21300-series series at 50 mm bore (110×27 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21310; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 159/166 kN ratings are SKF catalogue values for this exact execution (21310 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21310 (cylindrical bore as listed, tapered-bore 21310 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21310 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21310?", "a": "The 21310 E is a double-row spherical roller bearing with 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1350 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21310 bore code work?", "a": "The last two digits of 21310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 27 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21310?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21310 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21310K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21310 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21310-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H310 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21310", "21310 E" ], "locale_variants": {} }, { "sku": "21311", "brand": "SKF", "manufacturer_designation": "SKF 21311 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21311 E belongs to the SKF spherical roller range — the 55 mm bore entry in the 21300-series series (dimension series 13 (heavy OD, normal width)), dimensioned 120 mm OD and 29 mm wide. Numbering ties the bearing to its envelope: 21311 means spherical-roller type, dimension series 13, 55 mm bore — which is why the 120×29 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 1700 g for the 55×120×29 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 21311 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "extruder gearbox shafts", "vibrating screen and scalper main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 21300-series series at 55 mm bore (120×29 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 1700 g mass and 29 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21311.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 159/166 kN ratings are SKF catalogue values for this exact execution (21311 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21311 (cylindrical bore as listed, tapered-bore 21311 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21311 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21311?", "a": "The 21311 E is a double-row spherical roller bearing with 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 166 kN, fatigue load limit Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1700 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21311 bore code work?", "a": "The last two digits of 21311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 29 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21311?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21311 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21311K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21311 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21311-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21311-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H311 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21311", "21311 E" ], "locale_variants": {} }, { "sku": "21312", "brand": "SKF", "manufacturer_designation": "SKF 21312 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 217, "static_load_kN": 240, "fatigue_load_limit_kN": 26.5, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 60 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 21312 under catalogue execution 21312 E: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 21312 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 12 for the 60 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 4,800 r/min reference speed the 35.0 mm-section 21312 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 21312 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 60 mm bore 21312 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 60 mm bore (130×31 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21312; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Catalogue reference speed and limiting speed are different limits: the 4,800 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 217/240 kN ratings are SKF catalogue values for this exact execution (21312 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21312 (cylindrical bore as listed, tapered-bore 21312 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21312 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21312?", "a": "The 21312 E is a double-row spherical roller bearing with 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 217 kN, C0 240 kN, fatigue load limit Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2100 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21312 bore code work?", "a": "The last two digits of 21312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21312?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21312 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21312K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21312 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21312-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H312 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21312", "21312 E" ], "locale_variants": {} }, { "sku": "21313", "brand": "SKF", "manufacturer_designation": "SKF 21313 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 243, "static_load_kN": 270, "fatigue_load_limit_kN": 29, "max_rpm": 6000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 21313 (21313 E) is the spherical-roller choice for a 65 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 140×33 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 13 = 65 mm; dimensions 65×140×33 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 65 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 65 mm bore 21313 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 65 mm bore (140×33 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21313 pits long before its L10 life.", "The 243/270 kN ratings are SKF catalogue values for this exact execution (21313 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21313 (cylindrical bore as listed, tapered-bore 21313 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21313 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21313?", "a": "The 21313 E is a double-row spherical roller bearing with 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 243 kN, C0 270 kN, fatigue load limit Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2550 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21313 bore code work?", "a": "The last two digits of 21313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21313?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21313 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21313K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21313 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21313-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H313 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21313", "21313 E" ], "locale_variants": {} }, { "sku": "21314", "brand": "SKF", "manufacturer_designation": "SKF 21314 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 21314 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 70 mm shaft, dimension series 13 (heavy OD, normal width), with open execution and a stamped window-type steel cage. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 70 mm bore; the 150 mm OD and 35 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 291 kN and C0 325 kN, the 21314 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 35 mm width across two roller rows needs the full charge.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 70 mm bore 21314 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 70 mm bore (150×35 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Catalogue reference speed and limiting speed are different limits: the 4,000 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.", "The 21314 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 291/325 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 291/325 kN ratings are SKF catalogue values for this exact execution (21314 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21314 (cylindrical bore as listed, tapered-bore 21314 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21314 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21314?", "a": "The 21314 E is a double-row spherical roller bearing with 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3100 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21314 bore code work?", "a": "The last two digits of 21314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 35 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21314?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21314 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21314K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21314 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21314-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H314 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21314", "21314 E" ], "locale_variants": {} }, { "sku": "21315", "brand": "SKF", "manufacturer_designation": "SKF 21315 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21315 is a double-row spherical roller bearing in the 21300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 21315 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 15 resolving to 75 mm; 160 mm OD and 37 mm width are the matching ISO 15 boundary values. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 34.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.12 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 75 mm bore 21315 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 75 mm bore (160×37 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21315 pits long before its L10 life.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 291/325 kN ratings are SKF catalogue values for this exact execution (21315 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21315 (cylindrical bore as listed, tapered-bore 21315 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21315 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21315?", "a": "The 21315 E is a double-row spherical roller bearing with 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 291 kN, C0 325 kN, fatigue load limit Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3750 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21315 bore code work?", "a": "The last two digits of 21315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 37 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21315?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21315 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21315K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21315 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21315-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H315 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21315", "21315 E" ], "locale_variants": {} }, { "sku": "21316", "brand": "SKF", "manufacturer_designation": "SKF 21316 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 4450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 21316 E is a 80×170×39 mm spherical roller bearing — the dimension series 13 (heavy OD, normal width) entry for a 80 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 21316 means spherical-roller type, dimension series 13, 80 mm bore — which is why the 170×39 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Selection arithmetic: the C0/C ratio is about 1.13 (static 375 kN against dynamic 331 kN), typical of a spherical roller sized for heavy combined loads, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 80 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 80 mm bore 21316 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 80 mm bore (170×39 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 21316 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 331/375 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4450 g mass and 39 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21316.", "The 331/375 kN ratings are SKF catalogue values for this exact execution (21316 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21316 (cylindrical bore as listed, tapered-bore 21316 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21316 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21316?", "a": "The 21316 E is a double-row spherical roller bearing with 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 4450 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21316 bore code work?", "a": "The last two digits of 21316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 39 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21316?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21316 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21316K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21316 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21316-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H316 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21316", "21316 E" ], "locale_variants": {} }, { "sku": "21317", "brand": "SKF", "manufacturer_designation": "SKF 21317 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 5200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21317 appears as 21317 E: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 85×180×41 mm to the ISO 15 boundary plan. On the SKF nameplate, 21317 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 17 for the 85 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. The 47.5 mm radial section height ((180−85)/2) and 5200 g catalogue mass frame a 85 mm bore bearing rated at 331 kN C — roughly 3.89 kN of dynamic capacity per millimetre of bore before application factors. A 85 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 85 mm bore 21317 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 85 mm bore (180×41 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21317; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 331/375 kN ratings are SKF catalogue values for this exact execution (21317 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21317 (cylindrical bore as listed, tapered-bore 21317 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21317 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21317?", "a": "The 21317 E is a double-row spherical roller bearing with 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 331 kN, C0 375 kN, fatigue load limit Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 5200 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21317 bore code work?", "a": "The last two digits of 21317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 41 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21317?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21317 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21317K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21317 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21317-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21317-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H317 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21317", "21317 E" ], "locale_variants": {} }, { "sku": "21318", "brand": "SKF", "manufacturer_designation": "SKF 21318 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 393, "static_load_kN": 450, "fatigue_load_limit_kN": 45.5, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 6100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21318 E belongs to the SKF spherical roller range — the 90 mm bore entry in the 21300-series series (dimension series 13 (heavy OD, normal width)), dimensioned 190 mm OD and 43 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 18 = 90 mm; dimensions 90×190×43 mm therefore match the ISO 15 envelope. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Catalogue mass 6100 g for the 90×190×43 mm open execution covers the a stamped window-type steel cage; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 21318 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 90 mm bore 21318 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 90 mm bore (190×43 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 6100 g mass and 43 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21318.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 393/450 kN ratings are SKF catalogue values for this exact execution (21318 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21318 (cylindrical bore as listed, tapered-bore 21318 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21318 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21318?", "a": "The 21318 E is a double-row spherical roller bearing with 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 393 kN, C0 450 kN, fatigue load limit Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 6100 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21318 bore code work?", "a": "The last two digits of 21318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 43 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21318?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21318 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21318K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21318 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21318-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H318 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21318", "21318 E" ], "locale_variants": {} }, { "sku": "21319", "brand": "SKF", "manufacturer_designation": "SKF 21319 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 7050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 95 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 21319 under catalogue execution 21319 E: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 95 mm bore; the 200 mm OD and 45 mm width follow the ISO 15 general plan. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. At 3,400 r/min reference speed the 52.5 mm-section 21319 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,500 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 21319 EK variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 95 mm bore 21319 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 95 mm bore (200×45 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21319; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,500 r/min limiting value is the mechanical ceiling — observe both.", "The 433/490 kN ratings are SKF catalogue values for this exact execution (21319 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21319 (cylindrical bore as listed, tapered-bore 21319 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21319 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21319?", "a": "The 21319 E is a double-row spherical roller bearing with 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 7050 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21319 bore code work?", "a": "The last two digits of 21319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 45 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21319?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21319 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21319K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21319 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21319-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H319 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21319", "21319 E" ], "locale_variants": {} }, { "sku": "21320", "brand": "SKF", "manufacturer_designation": "SKF 21320 E", "series": "21300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 21320 (21320 E) is the spherical-roller choice for a 100 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 215×47 mm ISO 15 envelope. On the SKF nameplate, 21320 follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 20 for the 100 mm bore. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. With C 433 kN and C0 490 kN, the 21320 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 100 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 100 mm bore 21320 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 100 mm bore (215×47 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21320; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 433/490 kN ratings are SKF catalogue values for this exact execution (21320 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 21320 (cylindrical bore as listed, tapered-bore 21320 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21320 E designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21320?", "a": "The 21320 E is a double-row spherical roller bearing with 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 433 kN, C0 490 kN, fatigue load limit Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 8600 g. It is an open, self-aligning bearing with a stamped window-type steel cage." }, { "q": "How does the 21320 bore code work?", "a": "The last two digits of 21320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 47 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E suffix mean on 21320?", "a": "E is the SKF optimized internal design with larger rollers and a stamped window-type steel cage for higher load ratings. The EK variant is the same bearing with a 1:12 tapered bore for adapter sleeves." }, { "q": "Can 21320 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21320K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21320 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21320-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "21320-EK", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H320 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21320", "21320 E" ], "locale_variants": {} }, { "sku": "23022", "brand": "SKF", "manufacturer_designation": "SKF 23022 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 326, "static_load_kN": 440, "fatigue_load_limit_kN": 46.5, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23022 under catalogue execution 23022 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23022 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 22 resolving to 110 mm; 170 mm OD and 45 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 3800 g for the 110×170×45 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23022 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 110 mm bore 23022 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23000-series series at 110 mm bore (170×45 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23022 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 326/440 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 326/440 kN ratings are SKF catalogue values for this exact execution (23022 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23022 (cylindrical bore as listed, tapered-bore 23022 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23022 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23022?", "a": "The 23022 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 170 mm outer diameter and 45 mm width (4.331 × 6.693 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 326 kN, C0 440 kN, fatigue load limit Pu 46.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 3800 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23022 bore code work?", "a": "The last two digits of 23022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 45 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23022?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23022 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23022K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23022 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23022-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H322 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23022", "23022 CC/W33" ], "locale_variants": {} }, { "sku": "23024", "brand": "SKF", "manufacturer_designation": "SKF 23024 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 366, "static_load_kN": 500, "fatigue_load_limit_kN": 52, "max_rpm": 4000, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4000, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23024 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 120 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 23024 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 24 for the 120 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 3,200 r/min thermal reference and 4,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 120 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 120 mm bore (180×46 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 4200 g mass and 46 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23024.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23024; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 366/500 kN ratings are SKF catalogue values for this exact execution (23024 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23024 (cylindrical bore as listed, tapered-bore 23024 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23024 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23024?", "a": "The 23024 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 180 mm outer diameter and 46 mm width (4.724 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 366 kN, C0 500 kN, fatigue load limit Pu 52 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 4200 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23024 bore code work?", "a": "The last two digits of 23024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 46 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23024?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23024 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23024K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23024 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23024-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3024 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3024-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3024 V shares the 120×180×46 mm envelope but catalogue C/C0 differ (430/640 kN vs 366/500 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23024", "23024 CC/W33" ], "locale_variants": {} }, { "sku": "23026", "brand": "SKF", "manufacturer_designation": "SKF 23026 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 452, "static_load_kN": 610, "fatigue_load_limit_kN": 61, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 6000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23026 CC/W33 is a 130×200×52 mm spherical roller bearing — the dimension series 30 (slim OD, extra-wide) entry for a 130 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 130 mm bore; the 200 mm OD and 52 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 61 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.35 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 130 mm bore (200×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Catalogue reference speed and limiting speed are different limits: the 2,800 r/min reference is a thermal criterion under load, while the 3,600 r/min limiting value is the mechanical ceiling — observe both.", "The 452/610 kN ratings are SKF catalogue values for this exact execution (23026 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23026 (cylindrical bore as listed, tapered-bore 23026 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23026 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23026?", "a": "The 23026 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 200 mm outer diameter and 52 mm width (5.118 × 7.874 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 452 kN, C0 610 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 6000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23026 bore code work?", "a": "The last two digits of 23026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23026?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23026 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23026K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23026 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23026-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3026 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23026", "23026 CC/W33" ], "locale_variants": {} }, { "sku": "23028", "brand": "SKF", "manufacturer_designation": "SKF 23028 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 485, "static_load_kN": 680, "fatigue_load_limit_kN": 68, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 6550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23028 CC/W33 belongs to the SKF spherical roller range — the 140 mm bore entry in the 23000-series series (dimension series 30 (slim OD, extra-wide)), dimensioned 210 mm OD and 53 mm wide. Numbering ties the bearing to its envelope: 23028 means spherical-roller type, dimension series 30, 140 mm bore — which is why the 210×53 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 35.0 mm radial section height ((210−140)/2) and 6550 g catalogue mass frame a 140 mm bore bearing rated at 485 kN C — roughly 3.46 kN of dynamic capacity per millimetre of bore before application factors. A 140 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 140 mm bore (210×53 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23028 pits long before its L10 life.", "The 23028 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 485/680 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 485/680 kN ratings are SKF catalogue values for this exact execution (23028 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23028 (cylindrical bore as listed, tapered-bore 23028 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23028 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23028?", "a": "The 23028 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 485 kN, C0 680 kN, fatigue load limit Pu 68 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 6550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23028 bore code work?", "a": "The last two digits of 23028 are bore code 28, so 28 × 5 = 140 mm bore. The 210 mm OD and 53 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23028?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23028 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23028K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23028 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23028-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3028 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23028", "23028 CC/W33" ], "locale_variants": {} }, { "sku": "23030", "brand": "SKF", "manufacturer_designation": "SKF 23030 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 531, "static_load_kN": 750, "fatigue_load_limit_kN": 73.5, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 7950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23030 (23030 CC/W33) is the spherical-roller choice for a 150 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 225×56 mm ISO 15 envelope. Digit by digit, 23030 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 30 resolving to 150 mm; 225 mm OD and 56 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 2,400 r/min thermal reference and 3,200 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 150 mm bore (225×56 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23030 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 23030 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 531/750 kN ratings are SKF catalogue values for this exact execution (23030 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23030 (cylindrical bore as listed, tapered-bore 23030 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23030 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23030?", "a": "The 23030 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 225 mm outer diameter and 56 mm width (5.906 × 8.858 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 531 kN, C0 750 kN, fatigue load limit Pu 73.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 7950 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23030 bore code work?", "a": "The last two digits of 23030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 56 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23030?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23030 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23030K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23030 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23030-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3030 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3030-MB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 MB shares the 150×225×56 mm envelope but catalogue C/C0 differ (540/850 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3030-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 V shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3030-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 KV shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23030", "23030 CC/W33" ], "locale_variants": {} }, { "sku": "23032", "brand": "SKF", "manufacturer_designation": "SKF 23032 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 614, "static_load_kN": 880, "fatigue_load_limit_kN": 83, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 9700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23032 is a double-row spherical roller bearing in the 23000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23032 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 32 for the 160 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 83 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.43 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 160 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 160 mm bore (240×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 9700 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23032.", "The 9700 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23032.", "The 614/880 kN ratings are SKF catalogue values for this exact execution (23032 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23032 (cylindrical bore as listed, tapered-bore 23032 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23032 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23032?", "a": "The 23032 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 240 mm outer diameter and 60 mm width (6.299 × 9.449 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 614 kN, C0 880 kN, fatigue load limit Pu 83 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 9700 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23032 bore code work?", "a": "The last two digits of 23032 are bore code 32, so 32 × 5 = 160 mm bore. The 240 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23032?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23032 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23032K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23032 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23032-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3032 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23032", "23032 CC/W33" ], "locale_variants": {} }, { "sku": "23034", "brand": "SKF", "manufacturer_designation": "SKF 23034 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 745, "static_load_kN": 1060, "fatigue_load_limit_kN": 100, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23034 appears as 23034 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 170×260×67 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 170 mm bore; the 260 mm OD and 67 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 45.0 mm radial section height ((260−170)/2) and 13000 g catalogue mass frame a 170 mm bore bearing rated at 745 kN C — roughly 4.38 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23034 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 170 mm bore (260×67 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 745/1060 kN ratings are SKF catalogue values for this exact execution (23034 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23034 (cylindrical bore as listed, tapered-bore 23034 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23034 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23034?", "a": "The 23034 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 260 mm outer diameter and 67 mm width (6.693 × 10.236 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 745 kN, C0 1060 kN, fatigue load limit Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 13000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23034 bore code work?", "a": "The last two digits of 23034 are bore code 34, so 34 × 5 = 170 mm bore. The 260 mm OD and 67 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23034?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23034 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23034K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23034 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23034-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3034 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3034-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3034 M shares the 170×260×67 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23034", "23034 CC/W33" ], "locale_variants": {} }, { "sku": "23036", "brand": "SKF", "manufacturer_designation": "SKF 23036 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 883, "static_load_kN": 1250, "fatigue_load_limit_kN": 114, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 180 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23036 under catalogue execution 23036 CC/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 23036 means spherical-roller type, dimension series 30, 180 mm bore — which is why the 280×74 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 2,000 r/min reference speed the 50.0 mm-section 23036 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 74 mm width across two roller rows needs the full charge.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 180 mm bore (280×74 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23036 pits long before its L10 life.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23036 pits long before its L10 life.", "The 883/1250 kN ratings are SKF catalogue values for this exact execution (23036 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23036 (cylindrical bore as listed, tapered-bore 23036 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23036 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23036?", "a": "The 23036 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 280 mm outer diameter and 74 mm width (7.087 × 11.024 × 2.913 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 883 kN, C0 1250 kN, fatigue load limit Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 17000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23036 bore code work?", "a": "The last two digits of 23036 are bore code 36, so 36 × 5 = 180 mm bore. The 280 mm OD and 74 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23036?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23036 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23036K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23036 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23036-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3036 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3036", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3036 shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3036-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3036 K shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23036", "23036 CC/W33" ], "locale_variants": {} }, { "sku": "23038", "brand": "SKF", "manufacturer_designation": "SKF 23038 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 916, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23038 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 190 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 38 = 190 mm; dimensions 190×290×75 mm therefore match the ISO 15 envelope. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 916 kN and C0 1340 kN, the 23038 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 190 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 190 mm bore (290×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 916/1340 kN ratings are SKF catalogue values for this exact execution (23038 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23038 (cylindrical bore as listed, tapered-bore 23038 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23038 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23038?", "a": "The 23038 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 290 mm outer diameter and 75 mm width (7.48 × 11.417 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 916 kN, C0 1340 kN, fatigue load limit Pu 122 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 18000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23038 bore code work?", "a": "The last two digits of 23038 are bore code 38, so 38 × 5 = 190 mm bore. The 290 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23038?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23038 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23038K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23038 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23038-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3038 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3038", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3038 shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3038-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3038 K shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23038", "23038 CC/W33" ], "locale_variants": {} }, { "sku": "23040", "brand": "SKF", "manufacturer_designation": "SKF 23040 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1058, "static_load_kN": 1530, "fatigue_load_limit_kN": 137, "max_rpm": 2200, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2200, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23040 CC/W33 is a 200×310×82 mm spherical roller bearing — the dimension series 30 (slim OD, extra-wide) entry for a 200 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23040 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 40 for the 200 mm bore. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 55.0 mm radial section height ((310−200)/2) and 23500 g catalogue mass frame a 200 mm bore bearing rated at 1058 kN C — roughly 5.29 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 82 mm width across two roller rows needs the full charge.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 200 mm bore (310×82 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23500 g mass and 82 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23040.", "Shaft and housing fillets must clear the bearing chamfer so the 82 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1058/1530 kN ratings are SKF catalogue values for this exact execution (23040 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23040 (cylindrical bore as listed, tapered-bore 23040 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23040 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23040?", "a": "The 23040 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 310 mm outer diameter and 82 mm width (7.874 × 12.205 × 3.228 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1058 kN, C0 1530 kN, fatigue load limit Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,200 r/min, mass about 23500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23040 bore code work?", "a": "The last two digits of 23040 are bore code 40, so 40 × 5 = 200 mm bore. The 310 mm OD and 82 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23040?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23040 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23040K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23040 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23040-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AH3040 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3040", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3040 shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3040-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3040 K shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23040", "23040 CC/W33" ], "locale_variants": {} }, { "sku": "23044", "brand": "SKF", "manufacturer_designation": "SKF 23044 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1261, "static_load_kN": 1860, "fatigue_load_limit_kN": 163, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 30500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23044 (23044 CC/W33) is the spherical-roller choice for a 220 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 340×90 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 23044 means spherical-roller type, dimension series 30, 220 mm bore — which is why the 340×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1261 kN and C0 1860 kN, the 23044 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After mounting, swing the outer ring to confirm free self-alignment: the 23044 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 220 mm bore (340×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23044 pits long before its L10 life.", "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The 1261/1860 kN ratings are SKF catalogue values for this exact execution (23044 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23044 (cylindrical bore as listed, tapered-bore 23044 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23044 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23044?", "a": "The 23044 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 340 mm outer diameter and 90 mm width (8.661 × 13.386 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1261 kN, C0 1860 kN, fatigue load limit Pu 163 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 30500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23044 bore code work?", "a": "The last two digits of 23044 are bore code 44, so 44 × 5 = 220 mm bore. The 340 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23044?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23044 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23044K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23044 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23044-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH3044 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3044", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3044 shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3044-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3044 K shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23044", "23044 CC/W33" ], "locale_variants": {} }, { "sku": "23048", "brand": "SKF", "manufacturer_designation": "SKF 23048 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1340, "static_load_kN": 2080, "fatigue_load_limit_kN": 176, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 33500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23048 appears as 23048 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 240×360×92 mm to the ISO 15 boundary plan. Digit by digit, 23048 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 48 resolving to 240 mm; 360 mm OD and 92 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 33500 g for the 240×360×92 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 240 mm bore (360×92 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23048; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 33500 g mass and 92 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23048.", "The 1340/2080 kN ratings are SKF catalogue values for this exact execution (23048 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23048 (cylindrical bore as listed, tapered-bore 23048 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23048 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23048?", "a": "The 23048 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 360 mm outer diameter and 92 mm width (9.449 × 14.173 × 3.622 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1340 kN, C0 2080 kN, fatigue load limit Pu 176 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 33500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23048 bore code work?", "a": "The last two digits of 23048 are bore code 48, so 48 × 5 = 240 mm bore. The 360 mm OD and 92 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23048?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23048 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23048K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23048 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23048-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH3048 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3048", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3048 shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3048-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3048 K shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23048", "23048 CC/W33" ], "locale_variants": {} }, { "sku": "23052", "brand": "SKF", "manufacturer_designation": "SKF 23052 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1675, "static_load_kN": 2550, "fatigue_load_limit_kN": 212, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 48500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23052 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 260 mm shaft, dimension series 30 (slim OD, extra-wide), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23052 means spherical-roller type, dimension series 30, 260 mm bore — which is why the 400×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.52 (static 2550 kN against dynamic 1675 kN), typical of a spherical roller sized for heavy combined loads, and the 212 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 260 mm bore (400×104 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23052 pits long before its L10 life.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1675/2550 kN ratings are SKF catalogue values for this exact execution (23052 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23052 (cylindrical bore as listed, tapered-bore 23052 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23052 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23052?", "a": "The 23052 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 400 mm outer diameter and 104 mm width (10.236 × 15.748 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1675 kN, C0 2550 kN, fatigue load limit Pu 212 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 48500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23052 bore code work?", "a": "The last two digits of 23052 are bore code 52, so 52 × 5 = 260 mm bore. The 400 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23052?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23052 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23052K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23052 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23052-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3052 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3052", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3052 shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3052-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3052 K shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23052", "23052 CC/W33" ], "locale_variants": {} }, { "sku": "23056", "brand": "SKF", "manufacturer_designation": "SKF 23056 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1797, "static_load_kN": 2850, "fatigue_load_limit_kN": 224, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 52500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23056 CC/W33 belongs to the SKF spherical roller range — the 280 mm bore entry in the 23000-series series (dimension series 30 (slim OD, extra-wide)), dimensioned 420 mm OD and 106 mm wide. Digit by digit, 23056 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 56 resolving to 280 mm; 420 mm OD and 106 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,600 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23056 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 280 mm bore (420×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23056; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Shaft and housing fillets must clear the bearing chamfer so the 106 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1797/2850 kN ratings are SKF catalogue values for this exact execution (23056 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23056 (cylindrical bore as listed, tapered-bore 23056 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23056 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23056?", "a": "The 23056 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1797 kN, C0 2850 kN, fatigue load limit Pu 224 kN, reference speed 1,300 r/min, limiting speed 1,600 r/min, mass about 52500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23056 bore code work?", "a": "The last two digits of 23056 are bore code 56, so 56 × 5 = 280 mm bore. The 420 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23056?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23056 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23056K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23056 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23056-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3056 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3056", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3056 shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3056-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3056 K shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23056", "23056 CC/W33" ], "locale_variants": {} }, { "sku": "23060", "brand": "SKF", "manufacturer_designation": "SKF 23060 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2219, "static_load_kN": 3450, "fatigue_load_limit_kN": 265, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 71500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23060 is a double-row spherical roller bearing in the 23000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23060 means spherical-roller type, dimension series 30, 300 mm bore — which is why the 460×118 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 71500 g for the 300×460×118 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23060 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 300 mm bore (460×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23060 pits long before its L10 life.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23060; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 2219/3450 kN ratings are SKF catalogue values for this exact execution (23060 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23060 (cylindrical bore as listed, tapered-bore 23060 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23060 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23060?", "a": "The 23060 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 460 mm outer diameter and 118 mm width (11.811 × 18.11 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2219 kN, C0 3450 kN, fatigue load limit Pu 265 kN, reference speed 1,200 r/min, limiting speed 1,500 r/min, mass about 71500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23060 bore code work?", "a": "The last two digits of 23060 are bore code 60, so 60 × 5 = 300 mm bore. The 460 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23060?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23060 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23060K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23060 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23060-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3060 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3060-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3060 M shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3060-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3060 KM shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23060", "23060 CC/W33" ], "locale_variants": {} }, { "sku": "23064", "brand": "SKF", "manufacturer_designation": "SKF 23064 CC/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2348, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 78000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23064 under catalogue execution 23064 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23064 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 64 resolving to 320 mm; 480 mm OD and 121 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 285 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.62 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 320 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 320 mm bore (480×121 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23064; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 23064 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2348/3800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2348/3800 kN ratings are SKF catalogue values for this exact execution (23064 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23064 (cylindrical bore as listed, tapered-bore 23064 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23064 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23064?", "a": "The 23064 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 480 mm outer diameter and 121 mm width (12.598 × 18.898 × 4.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2348 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 78000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23064 bore code work?", "a": "The last two digits of 23064 are bore code 64, so 64 × 5 = 320 mm bore. The 480 mm OD and 121 mm width come from the ISO 15 dimension-series plan (dimension series 30 (slim OD, extra-wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23064?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23064 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23064K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23064 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23064-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3064 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3064-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3064 M shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3064-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3064 KM shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23064", "23064 CC/W33" ], "locale_variants": {} }, { "sku": "30302", "brand": "SKF", "manufacturer_designation": "SKF 30302", "series": "30300-series", "type": "tapered_roller", "d_mm": 15, "D_mm": 42, "B_mm": 14.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 27.7, "static_load_kN": 20, "fatigue_load_limit_kN": 2.08, "max_rpm": 18000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 18000, "weight_g": 94, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 15 mm shaft carrying combined load, SKF lists 30302 under catalogue execution SKF 30302: one open single-row tapered roller bearing in the heavy-OD section of the 30300 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 15 mm bore; the 42 mm OD and 14.25 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 0.72 (static 20 kN against dynamic 27.7 kN), typical of a tapered roller sized for axial capacity, and the 2.08 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 30302 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts", "steering knuckles and small differentials" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "At a 15 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30302 shows up as gearbox vibration long before it fails.", "The 303 series at 15 mm bore (42×14.25 mm) carries a larger OD and higher capacity than 30202 at the same bore; the bigger section runs hotter, so re-check the 18,000 r/min speed ceiling and shoulder diameters before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 30302 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 27.7 kN rating of 30302, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 18,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Open 30302 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 27.7/20 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30302 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30302 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30302?", "a": "The SKF 30302 is a single-row tapered roller bearing with 15 mm bore, 42 mm outer diameter and 14.25 mm width (0.591 × 1.654 × 0.561 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 27.7 kN, C0 20 kN, fatigue load limit Pu 2.08 kN, reference speed 15,000 r/min, limiting speed 18,000 r/min, mass about 94 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30302 bore code work?", "a": "The last two digits of 30302 are bore code 02, one of the small special codes: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm — here 02 = 15 mm bore. The 42 mm OD and 14.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30302 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30302 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30302 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30302 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30302-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30302", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30302" ], "locale_variants": {} }, { "sku": "30303", "brand": "SKF", "manufacturer_designation": "SKF 30303", "series": "30300-series", "type": "tapered_roller", "d_mm": 17, "D_mm": 47, "B_mm": 15.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 34.2, "static_load_kN": 25, "fatigue_load_limit_kN": 2.7, "max_rpm": 16000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 16000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30303 (SKF 30303) is the heavy-OD section tapered roller choice for a 17 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 47×15.25 mm ISO 355 envelope.Digit by digit, 30303 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 03 resolving to 17 mm; 47 mm OD and 15.25 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. The 15.0 mm radial section height ((47−17)/2) and 130 g catalogue mass frame a 17 mm bore bearing rated at 34.2 kN C — roughly 2.01 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30303 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "electric-motor pinion shafts", "steering knuckles and small differentials", "agricultural implement hubs", "small conveyor drive pulleys" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 17 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30303 shows up as gearbox vibration long before it fails.", "The 303 series at 17 mm bore (47×15.25 mm) carries a larger OD and higher capacity than 30203 at the same bore; the bigger section runs hotter, so re-check the 16,000 r/min speed ceiling and shoulder diameters before substituting.", "A single 30303 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30303 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Shaft and housing fillets must clear the bearing chamfer so the 15.25 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 34.2/25 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30303 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30303 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30303?", "a": "The SKF 30303 is a single-row tapered roller bearing with 17 mm bore, 47 mm outer diameter and 15.25 mm width (0.669 × 1.85 × 0.6 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 34.2 kN, C0 25 kN, fatigue load limit Pu 2.7 kN, reference speed 13,000 r/min, limiting speed 16,000 r/min, mass about 130 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30303 bore code work?", "a": "The last two digits of 30303 are bore code 03, one of the small special codes: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm — here 03 = 17 mm bore. The 47 mm OD and 15.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30303 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30303 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30303 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30303 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30303-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30303", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30303" ], "locale_variants": {} }, { "sku": "30304", "brand": "SKF", "manufacturer_designation": "SKF 30304", "series": "30300-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 52, "B_mm": 16.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.9, "static_load_kN": 32.5, "fatigue_load_limit_kN": 3.55, "max_rpm": 14000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 14000, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 30304 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 20 mm shaft, heavy-OD section, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 30304 means tapered-roller type 3, heavy-OD section series 03, 20 mm bore — which is why the 52×16.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Catalogue mass 170 g for the 20×52×16.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30304 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "agricultural implement hubs", "small conveyor drive pulleys", "power-tool gear heads", "small automotive wheel hubs and trailer axles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30304 shows up as gearbox vibration long before it fails.", "The 303 series at 20 mm bore (52×16.25 mm) carries a larger OD and higher capacity than 30204 at the same bore; the bigger section runs hotter, so re-check the 14,000 r/min speed ceiling and shoulder diameters before substituting.", "At the 41.9 kN rating of 30304, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 14,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix brands or executions inside one 30304 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Catalogue reference speed and limiting speed are different limits: the 12,000 r/min reference is a thermal criterion under load, while the 14,000 r/min limiting value is the mechanical ceiling — observe both.", "The 41.9/32.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30304 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30304 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30304?", "a": "The SKF 30304 is a single-row tapered roller bearing with 20 mm bore, 52 mm outer diameter and 16.25 mm width (0.787 × 2.047 × 0.64 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 41.9 kN, C0 32.5 kN, fatigue load limit Pu 3.55 kN, reference speed 12,000 r/min, limiting speed 14,000 r/min, mass about 170 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30304 bore code work?", "a": "The last two digits of 30304 are bore code 04, so 04 × 5 = 20 mm bore. The 52 mm OD and 16.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30304 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30304 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30304 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30304 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30304" ], "locale_variants": {} }, { "sku": "30305", "brand": "SKF", "manufacturer_designation": "SKF 30305", "series": "30300-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 62, "B_mm": 18.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55.3, "static_load_kN": 43, "fatigue_load_limit_kN": 4.75, "max_rpm": 12000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 12000, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "30305 is a single-row tapered roller bearing in the ISO 30300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 30305 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 05 for the 25 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. At 9,500 r/min reference speed the 18.5 mm-section 30305 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 12,000 r/min as the mechanical ceiling. Because the contact line is tapered, one 30305 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 25 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "power-tool gear heads", "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 30305 shows up as gearbox vibration long before it fails.", "The 303 series at 25 mm bore (62×18.25 mm) carries a larger OD and higher capacity than 30205 at the same bore; the bigger section runs hotter, so re-check the 12,000 r/min speed ceiling and shoulder diameters before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30305 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30305 mounting error.", "The 30305 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 55.3/43 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30305 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30305 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30305?", "a": "The SKF 30305 is a single-row tapered roller bearing with 25 mm bore, 62 mm outer diameter and 18.25 mm width (0.984 × 2.441 × 0.719 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 55.3 kN, C0 43 kN, fatigue load limit Pu 4.75 kN, reference speed 9,500 r/min, limiting speed 12,000 r/min, mass about 260 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30305 bore code work?", "a": "The last two digits of 30305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 18.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30305 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30305 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30305 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30305 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30305-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30305" ], "locale_variants": {} }, { "sku": "30306", "brand": "SKF", "manufacturer_designation": "SKF 30306", "series": "30300-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 72, "B_mm": 20.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 69.2, "static_load_kN": 56, "fatigue_load_limit_kN": 6.4, "max_rpm": 10000, "reference_speed_rpm": 8000, "limiting_speed_rpm": 10000, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 30306 is a 30×72×20.75 mm single-row tapered roller bearing — the heavy-OD section entry in the 30300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.The code breaks down as type prefix 3 (tapered roller), series 03 (the heavy-OD section), and bore code 06 = 30 mm; dimensions 30×72×20.75 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 8,000 r/min thermal reference and 10,000 r/min mechanical limiting speed. For a 30 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 30306 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30306 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 30 mm bore (72×20.75 mm) carries a larger OD and higher capacity than 30206 at the same bore; the bigger section runs hotter, so re-check the 10,000 r/min speed ceiling and shoulder diameters before substituting.", "Do not mix brands or executions inside one 30306 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30306 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 72 mm cup race release as noise within the first running hours.", "The 69.2/56 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30306 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30306 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30306?", "a": "The SKF 30306 is a single-row tapered roller bearing with 30 mm bore, 72 mm outer diameter and 20.75 mm width (1.181 × 2.835 × 0.817 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.2 kN, C0 56 kN, fatigue load limit Pu 6.4 kN, reference speed 8,000 r/min, limiting speed 10,000 r/min, mass about 380 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30306 bore code work?", "a": "The last two digits of 30306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 20.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30306 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30306 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30306 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30306 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30306-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30306" ], "locale_variants": {} }, { "sku": "30307", "brand": "SKF", "manufacturer_designation": "SKF 30307", "series": "30300-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 80, "B_mm": 22.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.9, "static_load_kN": 73.5, "fatigue_load_limit_kN": 8.3, "max_rpm": 9000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 9000, "weight_g": 510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30307 appears as SKF 30307: an open, single-row tapered roller bearing in the heavy-OD section of the 30300 dimension series, supplied with a pressed-steel cage as standard.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 35 mm bore; the 80 mm OD and 22.75 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. With C 88.9 kN and C0 73.5 kN, the 30307 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 9,000 r/min. Mounting practice for 30307: the rotating cone takes the interference fit (k5 on a 35 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30307 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 35 mm bore (80×22.75 mm) carries a larger OD and higher capacity than 30207 at the same bore; the bigger section runs hotter, so re-check the 9,000 r/min speed ceiling and shoulder diameters before substituting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30307 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 30307 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 88.9/73.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30307 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30307 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30307?", "a": "The SKF 30307 is a single-row tapered roller bearing with 35 mm bore, 80 mm outer diameter and 22.75 mm width (1.378 × 3.15 × 0.896 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 88.9 kN, C0 73.5 kN, fatigue load limit Pu 8.3 kN, reference speed 7,500 r/min, limiting speed 9,000 r/min, mass about 510 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30307 bore code work?", "a": "The last two digits of 30307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 22.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30307 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30307 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30307 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30307 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30307-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "30307R", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30307" ], "locale_variants": {} }, { "sku": "30308", "brand": "SKF", "manufacturer_designation": "SKF 30308", "series": "30300-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 90, "B_mm": 25.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 95, "fatigue_load_limit_kN": 10.8, "max_rpm": 8000, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8000, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30308 belongs to the SKF single-row tapered roller range — the 40 mm bore entry in the 30300 series, dimensioned 90 mm OD and 25.25 mm wide to the ISO 355 boundary plan.Digit by digit, 30308 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 08 resolving to 40 mm; 90 mm OD and 25.25 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. The 10.8 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.90 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 30308 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30308 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 40 mm bore (90×25.25 mm) carries a larger OD and higher capacity than 30208 at the same bore; the bigger section runs hotter, so re-check the 8,000 r/min speed ceiling and shoulder diameters before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30308 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "A single 30308 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The 730 g mass and 25.25 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 30308.", "The 106/95 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30308 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30308 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30308?", "a": "The SKF 30308 is a single-row tapered roller bearing with 40 mm bore, 90 mm outer diameter and 25.25 mm width (1.575 × 3.543 × 0.994 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 106 kN, C0 95 kN, fatigue load limit Pu 10.8 kN, reference speed 6,300 r/min, limiting speed 8,000 r/min, mass about 730 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30308 bore code work?", "a": "The last two digits of 30308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 25.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30308 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30308 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30308 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30308 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30308-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30308" ], "locale_variants": {} }, { "sku": "30309", "brand": "SKF", "manufacturer_designation": "SKF 30309", "series": "30300-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 100, "B_mm": 27.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 132, "static_load_kN": 120, "fatigue_load_limit_kN": 14.3, "max_rpm": 7000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7000, "weight_g": 970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 45 mm shaft carrying combined load, SKF lists 30309 under catalogue execution SKF 30309: one open single-row tapered roller bearing in the heavy-OD section of the 30300 family.Numbering ties the bearing to its envelope: 30309 means tapered-roller type 3, heavy-OD section series 03, 45 mm bore — which is why the 100×27.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 0.91 (static 120 kN against dynamic 132 kN), typical of a tapered roller sized for axial capacity, and the 14.3 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 30309 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30309 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 45 mm bore (100×27.25 mm) carries a larger OD and higher capacity than 30209 at the same bore; the bigger section runs hotter, so re-check the 7,000 r/min speed ceiling and shoulder diameters before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 30309 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 132 kN rating of 30309, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 7,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Open 30309 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 132/120 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30309 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30309 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30309?", "a": "The SKF 30309 is a single-row tapered roller bearing with 45 mm bore, 100 mm outer diameter and 27.25 mm width (1.772 × 3.937 × 1.073 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 132 kN, C0 120 kN, fatigue load limit Pu 14.3 kN, reference speed 5,600 r/min, limiting speed 7,000 r/min, mass about 970 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30309 bore code work?", "a": "The last two digits of 30309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 27.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30309 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30309 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30309 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30309 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30309-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30309" ], "locale_variants": {} }, { "sku": "30310", "brand": "SKF", "manufacturer_designation": "SKF 30310", "series": "30300-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 110, "B_mm": 29.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 154, "static_load_kN": 140, "fatigue_load_limit_kN": 16.6, "max_rpm": 6300, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6300, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30310 (SKF 30310) is the heavy-OD section tapered roller choice for a 50 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 110×29.25 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 50 mm bore; the 110 mm OD and 29.25 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Catalogue mass 1250 g for the 50×110×29.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 30310 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30310 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 50 mm bore (110×29.25 mm) carries a larger OD and higher capacity than 30210 at the same bore; the bigger section runs hotter, so re-check the 6,300 r/min speed ceiling and shoulder diameters before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 30310 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 30310 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The 30310 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 154/140 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30310 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30310 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30310?", "a": "The SKF 30310 is a single-row tapered roller bearing with 50 mm bore, 110 mm outer diameter and 29.25 mm width (1.969 × 4.331 × 1.152 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 154 kN, C0 140 kN, fatigue load limit Pu 16.6 kN, reference speed 5,300 r/min, limiting speed 6,300 r/min, mass about 1250 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30310 bore code work?", "a": "The last two digits of 30310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 29.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30310 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30310 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30310 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30310 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30310-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30310" ], "locale_variants": {} }, { "sku": "30311", "brand": "SKF", "manufacturer_designation": "SKF 30311", "series": "30300-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 120, "B_mm": 31.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 176, "static_load_kN": 163, "fatigue_load_limit_kN": 19.3, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 30311 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 55 mm shaft, heavy-OD section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 30311 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 11 resolving to 55 mm; 120 mm OD and 31.5 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. At 4,800 r/min reference speed the 32.5 mm-section 30311 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,600 r/min as the mechanical ceiling. Mounting practice for 30311: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 30311 pair heats, loses setting control and smears the roller-rib contact.", "The 303 series at 55 mm bore (120×31.5 mm) carries a larger OD and higher capacity than 30211 at the same bore; the bigger section runs hotter, so re-check the 5,600 r/min speed ceiling and shoulder diameters before substituting.", "A single 30311 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "At the 176 kN rating of 30311, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,600 r/min speed end and heavier preload only where moment stiffness dominates.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 120 mm cup race release as noise within the first running hours.", "The 176/163 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30311 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30311 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30311?", "a": "The SKF 30311 is a single-row tapered roller bearing with 55 mm bore, 120 mm outer diameter and 31.5 mm width (2.165 × 4.724 × 1.24 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 176 kN, C0 163 kN, fatigue load limit Pu 19.3 kN, reference speed 4,800 r/min, limiting speed 5,600 r/min, mass about 1550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30311 bore code work?", "a": "The last two digits of 30311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 31.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30311 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30311 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30311 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30311 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30311-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "30311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30311" ], "locale_variants": {} }, { "sku": "30312", "brand": "SKF", "manufacturer_designation": "SKF 30312", "series": "30300-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 130, "B_mm": 33.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 196, "fatigue_load_limit_kN": 23.6, "max_rpm": 5300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "30312 is a single-row tapered roller bearing in the ISO 30300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Numbering ties the bearing to its envelope: 30312 means tapered-roller type 3, heavy-OD section series 03, 60 mm bore — which is why the 130×33.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2FB); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 5,300 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 30312 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 60 mm bore 30312 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 60 mm bore (130×33.5 mm) carries a larger OD and higher capacity than 30212 at the same bore; the bigger section runs hotter, so re-check the 5,300 r/min speed ceiling and shoulder diameters before substituting.", "At the 208 kN rating of 30312, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30312 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 208/196 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30312 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30312 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30312?", "a": "The SKF 30312 is a single-row tapered roller bearing with 60 mm bore, 130 mm outer diameter and 33.5 mm width (2.362 × 5.118 × 1.319 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 208 kN, C0 196 kN, fatigue load limit Pu 23.6 kN, reference speed 4,300 r/min, limiting speed 5,300 r/min, mass about 1950 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30312 bore code work?", "a": "The last two digits of 30312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 33.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30312 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30312 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30312 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30312 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30312" ], "locale_variants": {} }, { "sku": "30313", "brand": "SKF", "manufacturer_designation": "SKF 30313", "series": "30300-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 140, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 240, "static_load_kN": 228, "fatigue_load_limit_kN": 27.5, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 30313 is a 65×140×36 mm single-row tapered roller bearing — the heavy-OD section entry in the 30300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 30313 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 13 for the 65 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. With C 240 kN and C0 228 kN, the 30313 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,800 r/min. A single 30313 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 65 mm bore 30313 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 65 mm bore (140×36 mm) carries a larger OD and higher capacity than 30213 at the same bore; the bigger section runs hotter, so re-check the 4,800 r/min speed ceiling and shoulder diameters before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30313 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Do not mix brands or executions inside one 30313 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The 2400 g mass and 36 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 30313.", "The 240/228 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30313 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30313 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30313?", "a": "The SKF 30313 is a single-row tapered roller bearing with 65 mm bore, 140 mm outer diameter and 36 mm width (2.559 × 5.512 × 1.417 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 240 kN, C0 228 kN, fatigue load limit Pu 27.5 kN, reference speed 4,000 r/min, limiting speed 4,800 r/min, mass about 2400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30313 bore code work?", "a": "The last two digits of 30313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 36 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30313 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30313 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30313 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30313 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "30313R", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30313" ], "locale_variants": {} }, { "sku": "30314", "brand": "SKF", "manufacturer_designation": "SKF 30314", "series": "30300-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 150, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 271, "static_load_kN": 260, "fatigue_load_limit_kN": 31, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 2950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30314 appears as SKF 30314: an open, single-row tapered roller bearing in the heavy-OD section of the 30300 dimension series, supplied with a pressed-steel cage as standard.The code breaks down as type prefix 3 (tapered roller), series 03 (the heavy-OD section), and bore code 14 = 70 mm; dimensions 70×150×38 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. The 31 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.96 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 30314 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 70 mm bore 30314 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 70 mm bore (150×38 mm) carries a larger OD and higher capacity than 30214 at the same bore; the bigger section runs hotter, so re-check the 4,500 r/min speed ceiling and shoulder diameters before substituting.", "Do not mix brands or executions inside one 30314 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30314 mounting error.", "Open 30314 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 271/260 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30314 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30314 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30314?", "a": "The SKF 30314 is a single-row tapered roller bearing with 70 mm bore, 150 mm outer diameter and 38 mm width (2.756 × 5.906 × 1.496 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 271 kN, C0 260 kN, fatigue load limit Pu 31 kN, reference speed 3,800 r/min, limiting speed 4,500 r/min, mass about 2950 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30314 bore code work?", "a": "The last two digits of 30314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 38 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30314 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30314 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30314 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30314 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30314" ], "locale_variants": {} }, { "sku": "30315", "brand": "SKF", "manufacturer_designation": "SKF 30315", "series": "30300-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 301, "static_load_kN": 290, "fatigue_load_limit_kN": 34, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30315 belongs to the SKF single-row tapered roller range — the 75 mm bore entry in the 30300 series, dimensioned 160 mm OD and 40 mm wide to the ISO 355 boundary plan.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 75 mm bore; the 160 mm OD and 40 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 0.96 (static 290 kN against dynamic 301 kN), typical of a tapered roller sized for axial capacity, and the 34 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30315 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 75 mm bore 30315 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 75 mm bore (160×40 mm) carries a larger OD and higher capacity than 30215 at the same bore; the bigger section runs hotter, so re-check the 4,300 r/min speed ceiling and shoulder diameters before substituting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30315 mounting error.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30315 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 301/290 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30315 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30315 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30315?", "a": "The SKF 30315 is a single-row tapered roller bearing with 75 mm bore, 160 mm outer diameter and 40 mm width (2.953 × 6.299 × 1.575 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 301 kN, C0 290 kN, fatigue load limit Pu 34 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 3500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30315 bore code work?", "a": "The last two digits of 30315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 40 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30315 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30315 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30315 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30315 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30315" ], "locale_variants": {} }, { "sku": "30316", "brand": "SKF", "manufacturer_designation": "SKF 30316", "series": "30300-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 170, "B_mm": 42.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 333, "static_load_kN": 320, "fatigue_load_limit_kN": 36.5, "max_rpm": 4000, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4000, "weight_g": 4150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 80 mm shaft carrying combined load, SKF lists 30316 under catalogue execution SKF 30316: one open single-row tapered roller bearing in the heavy-OD section of the 30300 family.Digit by digit, 30316 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 16 resolving to 80 mm; 170 mm OD and 42.5 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. The 45.0 mm radial section height ((170−80)/2) and 4150 g catalogue mass frame a 80 mm bore bearing rated at 333 kN C — roughly 4.16 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 30316 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 80 mm bore 30316 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 80 mm bore (170×42.5 mm) carries a larger OD and higher capacity than 30216 at the same bore; the bigger section runs hotter, so re-check the 4,000 r/min speed ceiling and shoulder diameters before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30316 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Setting is a design value, not an assembly feel: excessive preload in the 30316 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Catalogue reference speed and limiting speed are different limits: the 3,200 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.", "The 333/320 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30316 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30316 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30316?", "a": "The SKF 30316 is a single-row tapered roller bearing with 80 mm bore, 170 mm outer diameter and 42.5 mm width (3.15 × 6.693 × 1.673 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 333 kN, C0 320 kN, fatigue load limit Pu 36.5 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 4150 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30316 bore code work?", "a": "The last two digits of 30316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 42.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30316 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30316 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30316 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30316 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30316" ], "locale_variants": {} }, { "sku": "30317", "brand": "SKF", "manufacturer_designation": "SKF 30317", "series": "30300-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 180, "B_mm": 44.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 372, "static_load_kN": 365, "fatigue_load_limit_kN": 40.5, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 4850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30317 (SKF 30317) is the heavy-OD section tapered roller choice for a 85 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 180×44.5 mm ISO 355 envelope.Numbering ties the bearing to its envelope: 30317 means tapered-roller type 3, heavy-OD section series 03, 85 mm bore — which is why the 180×44.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Catalogue mass 4850 g for the 85×180×44.5 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 85 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 30317 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 85 mm bore 30317 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 85 mm bore (180×44.5 mm) carries a larger OD and higher capacity than 30217 at the same bore; the bigger section runs hotter, so re-check the 3,800 r/min speed ceiling and shoulder diameters before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 30317 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 30317 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The 30317 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 372/365 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30317 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30317 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30317?", "a": "The SKF 30317 is a single-row tapered roller bearing with 85 mm bore, 180 mm outer diameter and 44.5 mm width (3.346 × 7.087 × 1.752 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 372 kN, C0 365 kN, fatigue load limit Pu 40.5 kN, reference speed 3,000 r/min, limiting speed 3,800 r/min, mass about 4850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30317 bore code work?", "a": "The last two digits of 30317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 44.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30317 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30317 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30317 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30317 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30317" ], "locale_variants": {} }, { "sku": "30318", "brand": "SKF", "manufacturer_designation": "SKF 30318", "series": "30300-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 190, "B_mm": 46.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 353, "static_load_kN": 400, "fatigue_load_limit_kN": 44, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 5650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 30318 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 90 mm shaft, heavy-OD section, with an open pressed-steel-cage execution and one-direction axial capacity.On the SKF nameplate, 30318 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 18 for the 90 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. At 2,600 r/min reference speed the 50.0 mm-section 30318 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 3,600 r/min as the mechanical ceiling. Mounting practice for 30318: the rotating cone takes the interference fit (k5 on a 90 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 90 mm bore 30318 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 90 mm bore (190×46.5 mm) carries a larger OD and higher capacity than 30218 at the same bore; the bigger section runs hotter, so re-check the 3,600 r/min speed ceiling and shoulder diameters before substituting.", "A single 30318 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "At the 353 kN rating of 30318, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,600 r/min speed end and heavier preload only where moment stiffness dominates.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 190 mm cup race release as noise within the first running hours.", "The 353/400 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30318 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30318 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30318?", "a": "The SKF 30318 is a single-row tapered roller bearing with 90 mm bore, 190 mm outer diameter and 46.5 mm width (3.543 × 7.48 × 1.831 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 353 kN, C0 400 kN, fatigue load limit Pu 44 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 5650 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30318 bore code work?", "a": "The last two digits of 30318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 46.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30318 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30318 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30318 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30318 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30318" ], "locale_variants": {} }, { "sku": "30319", "brand": "SKF", "manufacturer_designation": "SKF 30319", "series": "30300-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 200, "B_mm": 49.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 353, "static_load_kN": 390, "fatigue_load_limit_kN": 42.5, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 6450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "30319 is a single-row tapered roller bearing in the ISO 30300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The code breaks down as type prefix 3 (tapered roller), series 03 (the heavy-OD section), and bore code 19 = 95 mm; dimensions 95×200×49.5 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 2,600 r/min thermal reference and 3,400 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 30319 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 95 mm bore 30319 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 95 mm bore (200×49.5 mm) carries a larger OD and higher capacity than 30219 at the same bore; the bigger section runs hotter, so re-check the 3,400 r/min speed ceiling and shoulder diameters before substituting.", "At the 353 kN rating of 30319, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,400 r/min speed end and heavier preload only where moment stiffness dominates.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30319 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 353/390 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30319 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30319 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30319?", "a": "The SKF 30319 is a single-row tapered roller bearing with 95 mm bore, 200 mm outer diameter and 49.5 mm width (3.74 × 7.874 × 1.949 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 353 kN, C0 390 kN, fatigue load limit Pu 42.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 6450 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30319 bore code work?", "a": "The last two digits of 30319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 49.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30319 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30319 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30319 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30319 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30319" ], "locale_variants": {} }, { "sku": "30320", "brand": "SKF", "manufacturer_designation": "SKF 30320", "series": "30300-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 215, "B_mm": 51.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 431, "static_load_kN": 490, "fatigue_load_limit_kN": 53, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 7950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 30320 is a 100×215×51.5 mm single-row tapered roller bearing — the heavy-OD section entry in the 30300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 30320 means tapered-roller type 3, heavy-OD section series 03, 100 mm bore — which is why the 215×51.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. The 53 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.14 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Because the contact line is tapered, one 30320 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 100 mm bore 30320 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 100 mm bore (215×51.5 mm) carries a larger OD and higher capacity than 30220 at the same bore; the bigger section runs hotter, so re-check the 3,200 r/min speed ceiling and shoulder diameters before substituting.", "At the 431 kN rating of 30320, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,200 r/min speed end and heavier preload only where moment stiffness dominates.", "At the 431 kN rating of 30320, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,200 r/min speed end and heavier preload only where moment stiffness dominates.", "Shaft and housing fillets must clear the bearing chamfer so the 51.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 431/490 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30320 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30320 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30320?", "a": "The SKF 30320 is a single-row tapered roller bearing with 100 mm bore, 215 mm outer diameter and 51.5 mm width (3.937 × 8.465 × 2.028 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 431 kN, C0 490 kN, fatigue load limit Pu 53 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 7950 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30320 bore code work?", "a": "The last two digits of 30320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 51.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30320 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30320 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30320 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30320 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30320" ], "locale_variants": {} }, { "sku": "30321", "brand": "SKF", "manufacturer_designation": "SKF 30321", "series": "30300-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 225, "B_mm": 53.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 462, "static_load_kN": 530, "fatigue_load_limit_kN": 57, "max_rpm": 3000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3000, "weight_g": 9100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30321 appears as SKF 30321: an open, single-row tapered roller bearing in the heavy-OD section of the 30300 dimension series, supplied with a pressed-steel cage as standard.On the SKF nameplate, 30321 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 21 for the 105 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 1.15 (static 530 kN against dynamic 462 kN), typical of a tapered roller sized for axial capacity, and the 57 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 30321 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 105 mm bore 30321 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 105 mm bore (225×53.5 mm) carries a larger OD and higher capacity than 30221 at the same bore; the bigger section runs hotter, so re-check the 3,000 r/min speed ceiling and shoulder diameters before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30321 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30321 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.", "The 462/530 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30321 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30321 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30321?", "a": "The SKF 30321 is a single-row tapered roller bearing with 105 mm bore, 225 mm outer diameter and 53.5 mm width (4.134 × 8.858 × 2.106 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 462 kN, C0 530 kN, fatigue load limit Pu 57 kN, reference speed 2,200 r/min, limiting speed 3,000 r/min, mass about 9100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30321 bore code work?", "a": "The last two digits of 30321 are bore code 21, so 21 × 5 = 105 mm bore. The 225 mm OD and 53.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30321 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30321 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30321 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30321 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30321", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30321" ], "locale_variants": {} }, { "sku": "30322", "brand": "SKF", "manufacturer_designation": "SKF 30322", "series": "30300-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 240, "B_mm": 54.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 507, "static_load_kN": 585, "fatigue_load_limit_kN": 62, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30322 belongs to the SKF single-row tapered roller range — the 110 mm bore entry in the 30300 series, dimensioned 240 mm OD and 54.5 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 03 (the heavy-OD section), and bore code 22 = 110 mm; dimensions 110×240×54.5 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. The 65.0 mm radial section height ((240−110)/2) and 11000 g catalogue mass frame a 110 mm bore bearing rated at 507 kN C — roughly 4.61 kN of dynamic capacity per millimetre of bore before application factors. Mounting practice for 30322: the rotating cone takes the interference fit (m6 on a 110 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 110 mm bore 30322 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 303 series at 110 mm bore (240×54.5 mm) carries a larger OD and higher capacity than 30222 at the same bore; the bigger section runs hotter, so re-check the 2,800 r/min speed ceiling and shoulder diameters before substituting.", "Do not mix brands or executions inside one 30322 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Do not mix brands or executions inside one 30322 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The 30322 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 507/585 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30322 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30322 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30322?", "a": "The SKF 30322 is a single-row tapered roller bearing with 110 mm bore, 240 mm outer diameter and 54.5 mm width (4.331 × 9.449 × 2.146 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 507 kN, C0 585 kN, fatigue load limit Pu 62 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 11000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30322 bore code work?", "a": "The last two digits of 30322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 54.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30322 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30322 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30322 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30322 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30322" ], "locale_variants": {} }, { "sku": "30324", "brand": "SKF", "manufacturer_designation": "SKF 30324", "series": "30300-series", "type": "tapered_roller", "d_mm": 120, "D_mm": 260, "B_mm": 59.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 601, "static_load_kN": 710, "fatigue_load_limit_kN": 73.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 30324 (SKF 30324) is the heavy-OD section tapered roller choice for a 120 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 260×59.5 mm ISO 355 envelope.Digit by digit, 30324 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 24 resolving to 120 mm; 260 mm OD and 59.5 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. At 2,000 r/min reference speed the 70.0 mm-section 30324 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. A single 30324 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "rolling-mill roll-neck bearings", "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 120 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 120 mm bore (260×59.5 mm) carries a larger OD and higher capacity than 30224 at the same bore; the bigger section runs hotter, so re-check the 2,600 r/min speed ceiling and shoulder diameters before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30324 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30324 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 601/710 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30324 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30324 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30324?", "a": "The SKF 30324 is a single-row tapered roller bearing with 120 mm bore, 260 mm outer diameter and 59.5 mm width (4.724 × 10.236 × 2.343 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 601 kN, C0 710 kN, fatigue load limit Pu 73.5 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 13500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30324 bore code work?", "a": "The last two digits of 30324 are bore code 24, so 24 × 5 = 120 mm bore. The 260 mm OD and 59.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30324 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30324 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30324 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30324 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30324" ], "locale_variants": {} }, { "sku": "30326", "brand": "SKF", "manufacturer_designation": "SKF 30326", "series": "30300-series", "type": "tapered_roller", "d_mm": 130, "D_mm": 280, "B_mm": 63.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 679, "static_load_kN": 800, "fatigue_load_limit_kN": 81.5, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "30326 is a single-row tapered roller bearing in the ISO 30300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 30326 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 26 for the 130 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. With C 679 kN and C0 800 kN, the 30326 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 2,400 r/min. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30326 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "At 130 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 130 mm bore (280×63.75 mm) carries a larger OD and higher capacity than 30226 at the same bore; the bigger section runs hotter, so re-check the 2,400 r/min speed ceiling and shoulder diameters before substituting.", "A single 30326 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "A single 30326 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Open 30326 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 679/800 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30326 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30326 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30326?", "a": "The SKF 30326 is a single-row tapered roller bearing with 130 mm bore, 280 mm outer diameter and 63.75 mm width (5.118 × 11.024 × 2.51 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 679 kN, C0 800 kN, fatigue load limit Pu 81.5 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30326 bore code work?", "a": "The last two digits of 30326 are bore code 26, so 26 × 5 = 130 mm bore. The 280 mm OD and 63.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30326 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30326 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30326 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30326 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30326" ], "locale_variants": {} }, { "sku": "30328", "brand": "SKF", "manufacturer_designation": "SKF 30328", "series": "30300-series", "type": "tapered_roller", "d_mm": 140, "D_mm": 300, "B_mm": 67.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 787, "static_load_kN": 950, "fatigue_load_limit_kN": 93, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 30328 appears as SKF 30328: an open, single-row tapered roller bearing in the heavy-OD section of the 30300 dimension series, supplied with a pressed-steel cage as standard.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 03 is the ISO 355 diameter/width series (heavy-OD section), and the last two digits encode the 140 mm bore; the 300 mm OD and 67.75 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 1.21 (static 950 kN against dynamic 787 kN), typical of a tapered roller sized for axial capacity, and the 93 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For a 140 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 30328 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts", "marine propulsion gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "At 140 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 140 mm bore (300×67.75 mm) carries a larger OD and higher capacity than 30228 at the same bore; the bigger section runs hotter, so re-check the 2,200 r/min speed ceiling and shoulder diameters before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30328 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30328 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Catalogue reference speed and limiting speed are different limits: the 1,700 r/min reference is a thermal criterion under load, while the 2,200 r/min limiting value is the mechanical ceiling — observe both.", "The 787/950 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30328 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30328 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30328?", "a": "The SKF 30328 is a single-row tapered roller bearing with 140 mm bore, 300 mm outer diameter and 67.75 mm width (5.512 × 11.811 × 2.667 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 787 kN, C0 950 kN, fatigue load limit Pu 93 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 20500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30328 bore code work?", "a": "The last two digits of 30328 are bore code 28, so 28 × 5 = 140 mm bore. The 300 mm OD and 67.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30328 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30328 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30328 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30328 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30328" ], "locale_variants": {} }, { "sku": "30330", "brand": "SKF", "manufacturer_designation": "SKF 30330", "series": "30300-series", "type": "tapered_roller", "d_mm": 150, "D_mm": 320, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 879, "static_load_kN": 1060, "fatigue_load_limit_kN": 104, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 150 mm shaft carrying combined load, SKF lists 30330 under catalogue execution SKF 30330: one open single-row tapered roller bearing in the heavy-OD section of the 30300 family.The code breaks down as type prefix 3 (tapered roller), series 03 (the heavy-OD section), and bore code 30 = 150 mm; dimensions 150×320×72 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. At 1,600 r/min reference speed the 85.0 mm-section 30330 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 2,000 r/min as the mechanical ceiling. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 30330 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "rolling-mill roll-neck bearings", "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 150 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 150 mm bore (320×72 mm) carries a larger OD and higher capacity than 30230 at the same bore; the bigger section runs hotter, so re-check the 2,000 r/min speed ceiling and shoulder diameters before substituting.", "Do not mix brands or executions inside one 30330 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 30330 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 25000 g mass and 72 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 30330.", "The 879/1060 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30330 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30330 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30330?", "a": "The SKF 30330 is a single-row tapered roller bearing with 150 mm bore, 320 mm outer diameter and 72 mm width (5.906 × 12.598 × 2.835 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 879 kN, C0 1060 kN, fatigue load limit Pu 104 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 25000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30330 bore code work?", "a": "The last two digits of 30330 are bore code 30, so 30 × 5 = 150 mm bore. The 320 mm OD and 72 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30330 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30330 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30330 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30330 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30330" ], "locale_variants": {} }, { "sku": "30332", "brand": "SKF", "manufacturer_designation": "SKF 30332", "series": "30300-series", "type": "tapered_roller", "d_mm": 160, "D_mm": 340, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 970, "static_load_kN": 1180, "fatigue_load_limit_kN": 114, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 30332 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 160 mm shaft, heavy-OD section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 30332 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 32 resolving to 160 mm; 340 mm OD and 75 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. With C 970 kN and C0 1180 kN, the 30332 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 2,000 r/min. For a 160 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 30332 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "At 160 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 160 mm bore (340×75 mm) carries a larger OD and higher capacity than 30232 at the same bore; the bigger section runs hotter, so re-check the 2,000 r/min speed ceiling and shoulder diameters before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 30332 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 30332 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 970/1180 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30332 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30332 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30332?", "a": "The SKF 30332 is a single-row tapered roller bearing with 160 mm bore, 340 mm outer diameter and 75 mm width (6.299 × 13.386 × 2.953 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 970 kN, C0 1180 kN, fatigue load limit Pu 114 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 29000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30332 bore code work?", "a": "The last two digits of 30332 are bore code 32, so 32 × 5 = 160 mm bore. The 340 mm OD and 75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30332 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30332 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30332 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30332 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30332", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30332" ], "locale_variants": {} }, { "sku": "30334", "brand": "SKF", "manufacturer_designation": "SKF 30334", "series": "30300-series", "type": "tapered_roller", "d_mm": 170, "D_mm": 360, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1103, "static_load_kN": 1340, "fatigue_load_limit_kN": 129, "max_rpm": 1800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 30334 is a 170×360×80 mm single-row tapered roller bearing — the heavy-OD section entry in the 30300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 30334 follows the ISO 355 convention: 3 for the tapered-roller type, 03 for the heavy-OD section, final digits 34 for the 170 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 1.21 (static 1340 kN against dynamic 1103 kN), typical of a tapered roller sized for axial capacity, and the 129 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating cone — and two 30334 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts", "marine propulsion gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "At 170 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 303 series at 170 mm bore (360×80 mm) carries a larger OD and higher capacity than 30234 at the same bore; the bigger section runs hotter, so re-check the 1,800 r/min speed ceiling and shoulder diameters before substituting.", "A single 30334 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Setting is a design value, not an assembly feel: excessive preload in the 30334 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The 30334 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 1103/1340 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 30334 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30334 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 30334?", "a": "The SKF 30334 is a single-row tapered roller bearing with 170 mm bore, 360 mm outer diameter and 80 mm width (6.693 × 14.173 × 3.15 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1103 kN, C0 1340 kN, fatigue load limit Pu 129 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 34500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 30334 bore code work?", "a": "The last two digits of 30334 are bore code 34, so 34 × 5 = 170 mm bore. The 360 mm OD and 80 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 30334 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 30334 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 30334 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30334 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "30334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "30334" ], "locale_variants": {} }, { "sku": "31305", "brand": "SKF", "manufacturer_designation": "SKF 31305", "series": "31300-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 62, "B_mm": 18.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 46.6, "static_load_kN": 40, "fatigue_load_limit_kN": 4.4, "max_rpm": 11000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 11000, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 31305 (SKF 31305) is the steep-angle heavy section tapered roller choice for a 25 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 62×18.25 mm ISO 355 envelope.Digit by digit, 31305 reads as bearing type 3 (single-row tapered roller), steep-angle heavy section series 13, and bore reference 05 resolving to 25 mm; 62 mm OD and 18.25 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 8,500 r/min reference speed the 18.5 mm-section 31305 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 11,000 r/min as the mechanical ceiling. Because the contact line is tapered, one 31305 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 25 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "power-tool gear heads", "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 31305 shows up as gearbox vibration long before it fails.", "The 313 series at 25 mm bore (62×18.25 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30305 without re-running the pair calculation.", "Setting is a design value, not an assembly feel: excessive preload in the 31305 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Do not mix brands or executions inside one 31305 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Open 31305 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 46.6/40 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31305 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31305 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31305?", "a": "The SKF 31305 is a single-row tapered roller bearing with 25 mm bore, 62 mm outer diameter and 18.25 mm width (0.984 × 2.441 × 0.719 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 46.6 kN, C0 40 kN, fatigue load limit Pu 4.4 kN, reference speed 8,500 r/min, limiting speed 11,000 r/min, mass about 270 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31305 bore code work?", "a": "The last two digits of 31305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 18.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31305 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31305 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31305 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31305 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31305" ], "locale_variants": {} }, { "sku": "31306", "brand": "SKF", "manufacturer_designation": "SKF 31306", "series": "31300-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 72, "B_mm": 20.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 58.3, "static_load_kN": 50, "fatigue_load_limit_kN": 5.7, "max_rpm": 9500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 9500, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 31306 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 30 mm shaft, steep-angle heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 31306 means tapered-roller type 3, steep-angle heavy section series 13, 30 mm bore — which is why the 72×20.75 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 7,500 r/min thermal reference and 9,500 r/min mechanical limiting speed. For a 30 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 31306 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31306 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 30 mm bore (72×20.75 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30306 without re-running the pair calculation.", "A single 31306 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 31306 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 20.75 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 58.3/50 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31306 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31306 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31306?", "a": "The SKF 31306 is a single-row tapered roller bearing with 30 mm bore, 72 mm outer diameter and 20.75 mm width (1.181 × 2.835 × 0.817 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 58.3 kN, C0 50 kN, fatigue load limit Pu 5.7 kN, reference speed 7,500 r/min, limiting speed 9,500 r/min, mass about 390 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31306 bore code work?", "a": "The last two digits of 31306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 20.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31306 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31306 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31306 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31306 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31306" ], "locale_variants": {} }, { "sku": "31307", "brand": "SKF", "manufacturer_designation": "SKF 31307", "series": "31300-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 80, "B_mm": 22.75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 75.4, "static_load_kN": 67, "fatigue_load_limit_kN": 7.8, "max_rpm": 8500, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8500, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "31307 is a single-row tapered roller bearing in the ISO 31300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 31307 follows the ISO 355 convention: 3 for the tapered-roller type, 13 for the steep-angle heavy section, final digits 07 for the 35 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 75.4 kN and C0 67 kN, the 31307 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 8,500 r/min. Mounting practice for 31307: the rotating cone takes the interference fit (k5 on a 35 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31307 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 35 mm bore (80×22.75 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30307 without re-running the pair calculation.", "At the 75.4 kN rating of 31307, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,500 r/min speed end and heavier preload only where moment stiffness dominates.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 31307 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Catalogue reference speed and limiting speed are different limits: the 6,300 r/min reference is a thermal criterion under load, while the 8,500 r/min limiting value is the mechanical ceiling — observe both.", "The 75.4/67 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31307 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31307 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31307?", "a": "The SKF 31307 is a single-row tapered roller bearing with 35 mm bore, 80 mm outer diameter and 22.75 mm width (1.378 × 3.15 × 0.896 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 75.4 kN, C0 67 kN, fatigue load limit Pu 7.8 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 520 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31307 bore code work?", "a": "The last two digits of 31307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 22.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31307 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31307 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31307 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31307 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31307" ], "locale_variants": {} }, { "sku": "31308", "brand": "SKF", "manufacturer_designation": "SKF 31308", "series": "31300-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 90, "B_mm": 25.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 91.1, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.5, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 31308 is a 40×90×25.25 mm single-row tapered roller bearing — the steep-angle heavy section entry in the 31300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.The code breaks down as type prefix 3 (tapered roller), series 13 (the steep-angle heavy section), and bore code 08 = 40 mm; dimensions 40×90×25.25 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 9.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.89 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 31308 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31308 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 40 mm bore (90×25.25 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30308 without re-running the pair calculation.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 31308 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Setting is a design value, not an assembly feel: excessive preload in the 31308 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The 31308 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 91.1/81.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31308 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31308 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31308?", "a": "The SKF 31308 is a single-row tapered roller bearing with 40 mm bore, 90 mm outer diameter and 25.25 mm width (1.575 × 3.543 × 0.994 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 91.1 kN, C0 81.5 kN, fatigue load limit Pu 9.5 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 720 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31308 bore code work?", "a": "The last two digits of 31308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 25.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31308 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31308 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31308 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31308 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31308" ], "locale_variants": {} }, { "sku": "31309", "brand": "SKF", "manufacturer_designation": "SKF 31309", "series": "31300-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 100, "B_mm": 27.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 113, "static_load_kN": 102, "fatigue_load_limit_kN": 12.5, "max_rpm": 6700, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6700, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 31309 appears as SKF 31309: an open, single-row tapered roller bearing in the steep-angle heavy section of the 31300 dimension series, supplied with a pressed-steel cage as standard.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 13 is the ISO 355 diameter/width series (steep-angle heavy section), and the last two digits encode the 45 mm bore; the 100 mm OD and 27.25 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.90 (static 102 kN against dynamic 113 kN), typical of a tapered roller sized for axial capacity, and the 12.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 31309 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31309 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 45 mm bore (100×27.25 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30309 without re-running the pair calculation.", "Do not mix brands or executions inside one 31309 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "A single 31309 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 100 mm cup race release as noise within the first running hours.", "The 113/102 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31309 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31309 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31309?", "a": "The SKF 31309 is a single-row tapered roller bearing with 45 mm bore, 100 mm outer diameter and 27.25 mm width (1.772 × 3.937 × 1.073 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 113 kN, C0 102 kN, fatigue load limit Pu 12.5 kN, reference speed 5,000 r/min, limiting speed 6,700 r/min, mass about 950 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31309 bore code work?", "a": "The last two digits of 31309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 27.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31309 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31309 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31309 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31309 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31309" ], "locale_variants": {} }, { "sku": "31310", "brand": "SKF", "manufacturer_designation": "SKF 31310", "series": "31300-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 110, "B_mm": 29.25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 131, "static_load_kN": 120, "fatigue_load_limit_kN": 14.3, "max_rpm": 6000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 6000, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 31310 belongs to the SKF single-row tapered roller range — the 50 mm bore entry in the 31300 series, dimensioned 110 mm OD and 29.25 mm wide to the ISO 355 boundary plan.On the SKF nameplate, 31310 follows the ISO 355 convention: 3 for the tapered-roller type, 13 for the steep-angle heavy section, final digits 10 for the 50 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 1200 g for the 50×110×29.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 31310 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31310 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 50 mm bore (110×29.25 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30310 without re-running the pair calculation.", "Do not mix brands or executions inside one 31310 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Setting is a design value, not an assembly feel: excessive preload in the 31310 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Open 31310 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 131/120 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31310 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31310 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31310?", "a": "The SKF 31310 is a single-row tapered roller bearing with 50 mm bore, 110 mm outer diameter and 29.25 mm width (1.969 × 4.331 × 1.152 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 131 kN, C0 120 kN, fatigue load limit Pu 14.3 kN, reference speed 4,500 r/min, limiting speed 6,000 r/min, mass about 1200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31310 bore code work?", "a": "The last two digits of 31310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 29.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31310 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31310 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31310 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31310 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31310" ], "locale_variants": {} }, { "sku": "31311", "brand": "SKF", "manufacturer_designation": "SKF 31311", "series": "31300-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 120, "B_mm": 31.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 149, "static_load_kN": 137, "fatigue_load_limit_kN": 16.6, "max_rpm": 5600, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5600, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 55 mm shaft carrying combined load, SKF lists 31311 under catalogue execution SKF 31311: one open single-row tapered roller bearing in the steep-angle heavy section of the 31300 family.The code breaks down as type prefix 3 (tapered roller), series 13 (the steep-angle heavy section), and bore code 11 = 55 mm; dimensions 55×120×31.5 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 4,300 r/min reference speed the 32.5 mm-section 31311 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,600 r/min as the mechanical ceiling. Mounting practice for 31311: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 31311 pair heats, loses setting control and smears the roller-rib contact.", "The 313 series at 55 mm bore (120×31.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30311 without re-running the pair calculation.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 31311 mounting error.", "A single 31311 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Shaft and housing fillets must clear the bearing chamfer so the 31.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 149/137 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31311 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31311 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31311?", "a": "The SKF 31311 is a single-row tapered roller bearing with 55 mm bore, 120 mm outer diameter and 31.5 mm width (2.165 × 4.724 × 1.24 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 149 kN, C0 137 kN, fatigue load limit Pu 16.6 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 1550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31311 bore code work?", "a": "The last two digits of 31311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 31.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31311 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31311 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31311 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31311 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31311" ], "locale_variants": {} }, { "sku": "31312", "brand": "SKF", "manufacturer_designation": "SKF 31312", "series": "31300-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 130, "B_mm": 33.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 177, "static_load_kN": 166, "fatigue_load_limit_kN": 20.4, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 31312 (SKF 31312) is the steep-angle heavy section tapered roller choice for a 60 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 130×33.5 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 13 is the ISO 355 diameter/width series (steep-angle heavy section), and the last two digits encode the 60 mm bore; the 130 mm OD and 33.5 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 3,800 r/min thermal reference and 5,300 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 31312 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 60 mm bore 31312 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 60 mm bore (130×33.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30312 without re-running the pair calculation.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 31312 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 177 kN rating of 31312, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "Catalogue reference speed and limiting speed are different limits: the 3,800 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.", "The 177/166 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31312 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31312 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31312?", "a": "The SKF 31312 is a single-row tapered roller bearing with 60 mm bore, 130 mm outer diameter and 33.5 mm width (2.362 × 5.118 × 1.319 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 177 kN, C0 166 kN, fatigue load limit Pu 20.4 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 1900 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31312 bore code work?", "a": "The last two digits of 31312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 33.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31312 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31312 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31312 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31312 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31312" ], "locale_variants": {} }, { "sku": "31313", "brand": "SKF", "manufacturer_designation": "SKF 31313", "series": "31300-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 140, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 203, "static_load_kN": 193, "fatigue_load_limit_kN": 23.6, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 31313 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 65 mm shaft, steep-angle heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 31313 reads as bearing type 3 (single-row tapered roller), steep-angle heavy section series 13, and bore reference 13 resolving to 65 mm; 140 mm OD and 36 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. With C 203 kN and C0 193 kN, the 31313 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,800 r/min. A single 31313 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 65 mm bore 31313 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 65 mm bore (140×36 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30313 without re-running the pair calculation.", "Setting is a design value, not an assembly feel: excessive preload in the 31313 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 31313 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 31313 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 203/193 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31313 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31313 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31313?", "a": "The SKF 31313 is a single-row tapered roller bearing with 65 mm bore, 140 mm outer diameter and 36 mm width (2.559 × 5.512 × 1.417 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 203 kN, C0 193 kN, fatigue load limit Pu 23.6 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 2350 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31313 bore code work?", "a": "The last two digits of 31313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 36 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31313 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31313 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31313 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31313 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31313" ], "locale_variants": {} }, { "sku": "31314", "brand": "SKF", "manufacturer_designation": "SKF 31314", "series": "31300-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 150, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 220, "fatigue_load_limit_kN": 27, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "31314 is a single-row tapered roller bearing in the ISO 31300 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Numbering ties the bearing to its envelope: 31314 means tapered-roller type 3, steep-angle heavy section series 13, 70 mm bore — which is why the 150×38 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 27 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.96 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 31314 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 70 mm bore 31314 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 70 mm bore (150×38 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30314 without re-running the pair calculation.", "A single 31314 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Do not mix brands or executions inside one 31314 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 150 mm cup race release as noise within the first running hours.", "The 229/220 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31314 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31314 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31314?", "a": "The SKF 31314 is a single-row tapered roller bearing with 70 mm bore, 150 mm outer diameter and 38 mm width (2.756 × 5.906 × 1.496 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 229 kN, C0 220 kN, fatigue load limit Pu 27 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 2850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31314 bore code work?", "a": "The last two digits of 31314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 38 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31314 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31314 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31314 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31314 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31314" ], "locale_variants": {} }, { "sku": "31315", "brand": "SKF", "manufacturer_designation": "SKF 31315", "series": "31300-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 245, "fatigue_load_limit_kN": 29, "max_rpm": 4300, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "weight_g": 3400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 31315 is a 75×160×40 mm single-row tapered roller bearing — the steep-angle heavy section entry in the 31300 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the SKF nameplate, 31315 follows the ISO 355 convention: 3 for the tapered-roller type, 13 for the steep-angle heavy section, final digits 15 for the 75 mm bore. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 0.96 (static 245 kN against dynamic 255 kN), typical of a tapered roller sized for axial capacity, and the 29 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 31315 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 75 mm bore 31315 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 75 mm bore (160×40 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30315 without re-running the pair calculation.", "At the 255 kN rating of 31315, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,300 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 31315 mounting error.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 255/245 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31315 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31315 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31315?", "a": "The SKF 31315 is a single-row tapered roller bearing with 75 mm bore, 160 mm outer diameter and 40 mm width (2.953 × 6.299 × 1.575 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 255 kN, C0 245 kN, fatigue load limit Pu 29 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 3400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31315 bore code work?", "a": "The last two digits of 31315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 40 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31315 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31315 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31315 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31315 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31315" ], "locale_variants": {} } ]